in the fig1 through 3 , examples of devices are outlined for which the present invention is of use and advantageous . in fig1 , a computer 11 is schematically illustrated , which is equipped with a presentation unit 12 in the shape of a screen . keyboard 13 is arranged as a user interface , which keyboard serves as a control unit for the computer . further , the keyboard is arranged in a known manner with a plurality of data input means in the shape of keys 14 . the user gives control data to the keyboard by means of the keys and control signals are thereby transmitted from the keyboard in the figure , to the computer . said communication connection could be wire dependent or wireless . in the computer there is an interpreting means comprising a computer program devised to decode the control signals , so as to interpret which action or measures the user has ordered . fig2 schematically illustrates a tv - set 21 that is equipped with a presentation unit 22 in the shape of a picture tube , plasma screen or similar . the control unit 23 is a remote control , on which buttons or keys 24 are arranged for the input of control data . control signals are thereby transmitted from the remote control , by means of ir , bluetooth or cable , to the tv - set . in the tv - set , there is a receiver mounted , devised to act as an interpreting unit , for the purpose of interpreting which measures the user wants the tv - set to execute . fig3 schematically illustrates a mobile phone 31 , equipped with a display 32 . the control unit of the mobile phone is its key pad 33 , which is integrated with the apparatus 31 . the key pad is provided with buttons / keys 34 , and in some cases rotary controls or similar . when the control unit and the apparatus are integrated , the transmission of control signal is provided by means of physical connections , for example through cables or wires formed on a printed circuit board . common for all embodiments of the present invention is that the data input means of the control units are equipped with a presentation means 45 enabling immediate reconfiguration of the data input means . in a preferred embodiment of the invention , outlined in fig4 , each data input means include a lcd ( liquid crystal display ). in fig4 , the invention is illustrated for seven keys 44 of a computer keyboard , and it is understood that the arrangement with a display 45 on the key is valid for one or more of the control units &# 39 ; keys 44 , rotary controls etc . equally , it is understood that the control unit can have an arbitrary number of keys . consequently , the embodiment illustrated in fig4 should merely be considered as an example aiming to clearly illustrate the invention . in the preferred embodiment according to fig4 , each key comprises a 16 × 16 pixel lcd . each display 45 is encapsulated , meaning that the display 45 is not compressed when the key is pushed down . the arrangement with these variable presentation means 45 on the keys 44 has consequently no mechanical importance for the function of the keys , which keys can be arranged in a known manner with a matrix decoder or as totally separated contactors . referring to fig5 , a preferred embodiment of the invention is described below , wherein said control unit is a computer keyboard . fig5 shows schematically a preferred embodiment of a circuit solution for the control unit , i . e . the keyboard , according to the present invention . the control unit comprises a processor 51 , arranged to handle the presentation means of the data input units , i . e . the displays on the keys . through a pld ( programmable logic unit ) 52 , the processor 51 is connected to a memory means in the form of a flash rom 53 . data representing the different visual indicators the displays are set to show are stored in this memory 53 . consequently , pixel data for a number of different characters is stored therein . to the pld 52 and the memory 53 is also a second memory 54 connected , preferably a sram . in this second memory the configuration of the characters for the different keys of the keyboard is stored . in this second memory 54 , information is consequently stored indicating that key i , j shall show the character r , key i , j + 1 shall show the character t , etc . in this second memory 54 there are pointers , which point towards data stored in the first memory 53 , for the characters included in the configuration defined in the second memory 54 . the keyboard is operated in two modes : download and operation . in the download mode , the processor , which comprises an internal program and its own data memory , receives data from a computer . the received data comprises either appearance data for one or several keys , or configuration data with information on mapping of different characters on different keys . the appearance data thus describes the appearance for one or several separate keys , and therefor includes pixel data for a character or symbol . the configuration data describes the allocation of each character or symbol to different keys on the keyboard . when the download mode is initiated , the pld takes control of the data and addresses buses to memory banks . received configuration data is stored in the memory 54 , which enables rapid reconfiguration of the characters , while the appearance data for the characters is stored in the memory 53 for non - volatile storage when the current supply is turned off . when the download mode is completed , the pld &# 39 ; s exits are set to high impedance mode , and will thereby not interfere with the bus during the operation mode . during the operation mode , a binary counter 55 controls the address - lines to the configuration memory 54 by means of a clock pulse generator . the output data from the configuration memory 54 , which goes through the characters for the current configuration in a cyclic manner , is used to address the high eight bits in the character memory 53 . simultaneously the counter 55 addresses the display matrix 56 . in order to ease understanding , fig5 shows only nine displays 57 in the matrix 56 , but it is obvious to a person skilled in the art that an arbitrary number of displays can be included in the display matrix 56 . the displays 57 correspond to the displays 45 in fig4 . each display 57 corresponds to one key . the displays 57 of the matrix are addressed by the counter in a multiplexed manner , where rows and columns are addressed each in turn through a set of decoders and buffers . the decoder 58 circulates over the display rows , and the rows are addressed by means of a three - state buffer 59 . further , the decoder 60 is arranged to circulate through the display columns , and a decoder 61 is arranged to address pixel columns for each display column . preferably , the pixel columns of one display row are addressed at a time , in order to prevent the displays to flash at low frequencies . this is a solution comparable to the one used in tv interlacing , where odd and even rows are shown alternately . in a preferred embodiment of the invention , the decoder 60 first addresses the first display column . the decoder 58 circulates thereafter through the three - state buffers 59 from the first to the last row of the display , at which the pixel data for each pixel column is addressed by means of the first of the decoders 61 . thereafter , the decoder 60 addresses the second display column , and the output of pixel data to the respective display proceeds in a corresponding manner by cycling through the display rows . owing to the distinction between the data banks for the character configuration in memory 54 and the appearance of the characters in memory 53 , the characters can quickly be rearranged into a new configuration without needing to download new characters to the keyboard . thanks to the non - volatile nature of the flash - rom &# 39 ; s memory 53 , the characters do not have to be downloaded before each use of the keyboard . when downloading is needed , this is arranged through a suitable link 62 to a computer . it should be noted that during the operation mode the keyboard does not need to have access to a computer , which enables remote control of apparatuses . the keyboard must , however , have access to some sort of a power supply , preferably a battery . in a preferred embodiment said second memory 54 comprises configuration data for a number of pre - defined configurations of which only one can be active at a time . that enables a quick and easy rearrangement of the configuration of the keyboard for different purposes or users . in the preferred embodiment of the present invention described above , nothing concerning the function of the keys has been mentioned . irrespective of which character or symbol that is visually indicated on the keys , the same control signal is transferred from the keyboard to the computer at the activation of the keys . in an ordinary state of the art keyboard , which includes a matrix decoder , a scan code is transferred at the activation of a key , from the keyboard to the computer . in the keyboard according to the present invention , the transmission of the control signal , e . g . scan codes , can be transferred over the same communication link 62 , used for downloading data to the keyboard , or through some other communication link . in the computer , there is a scan code interpreting means or a decoder in the form of a computer program , arranged to interpret , based upon said control signal , which action the user wants to perform . in the present invention , said code decoder is intimately associated with the character configuration for the keyboard arranged to control the computer . for browsing and for selection of the configurations and the specific keys , the present invention includes a computer program product , which is preferably executable on the apparatus the control unit is adapted to control , i . e . the computer in what is now described . according to a first aspect , the computer program for selection is arranged to show a plurality of different character configurations to choose among . this is preferably done by visualizing the keyboards &# 39 ; 13 keys 14 on the computer &# 39 ; s 11 screen 12 , where each key is shown with the appearance and the location defined by the configuration in question . the computer program can be arranged to show one character configuration at a time , with the possibility to browse , or to show several different configurations simultaneously . according to this first aspect the computer program also includes means for selecting a specific character configuration , and means for transferring a quantity of data representing the selected character configuration to the control unit . in case the selected character configuration solely includes characters that are already stored in the memory 53 of the keyboard , the transmission of the new character configuration to the keyboard only brings about a change in the configuration memory 54 . if new characters are also included , then also memory 53 is updated . according to a second aspect , the computer program is arranged to show a visualization of the keys of the keyboard , and a set of characters to choose among on the computer &# 39 ; s screen . the characters to choose among can be shown on the screen in a matrix or a table and sorted in a alphabetic order , numeric order or by character type . with character type is meant for example letters , numbers , arrows etc . with the help of the mouse pointer , the appearance of the key can be selected by click - and - drag from the table to the key on the visualized keyboard to which one wishes to give the appearance in question . preferably one can also choose the action that is to be taken for each key . preferably there are a number of standard keys where the action is predefined , for example the letters and the numbers . in a preferred embodiment , the action related to the selected character is the printout of the actual character at activation of the selected key . by choosing amongst different actions from a list , for example by using the mouse and different menus , the software will however allow a change of action . during restructuring of the character configuration according to the second aspect , where in a very simple example , the a - and b - keys can be arranged to shift location , naturally , the control unit , i . e . the keyboard is also affected concerning the characters to be presented . in this example , the data is changed in memory 54 , so that the present configuration points onto the correct character in memory 53 with regards to the characters a and b . the possible change of action that is selected , which action is to be taken at activation of the a - and b - key , respectively , is registered in the scan code decoder of the computer but does not affect the keyboard . in a preferred embodiment of the computer program according to said second aspect , visualizing means are also included , for visualizing , on a computer screen , a return location for characters whereby characters can be pulled from keys on the visualized keyboard by means of the mouse pointer and be placed in the return location . the computer program is thereby arranged to automatically , and preferably visually , put back the returned character to its location in the character table . according to a third aspect , said computer program includes means for visualizing a character , wherein the possibility to edit the character is given . for the illustrated example in fig4 , where each character is represented by 16 × 16 pixels , such a pixel map is preferably visualized on the computer &# 39 ; s 11 screen 12 . the software subsequently enables marking of the pixels one wishes to activate , e . g . by means of the mouse pointer . when one has finished the editing , one clicks a ok - button presented by the computer program , at which the appearance for a new character is created . this character is then placed into the previously mentioned character table , in a location chosen by either the user or automatically by the computer program . in one embodiment the appearance data is also automatically downloaded to the keyboard for storage in memory 53 . during construction or editing of a character , the possibility of selecting action is also given , according to what has been said above . according to a fourth aspect , said computer program includes means for transfering picture data for an arbitrary picture to a file format that is adapted for presentation on the keys . therefor , the computer program is arranged to split the information of a given picture into 16 × 16 pixels , and to visually present the transformed picture for the user on the computer screen . the transformed picture can then be edited according to the above - mentioned third aspect . according to a preferred embodiment of the invention , the computer is communicatively connectable to a database in a communication network , e . g . the internet . further , the computer includes means for receiving and transmitting data from and to the above - mentioned database . by data is here meant both the separate appearance data for keys and the configuration data for the whole keyboard . the apparatus further comprises means for downloading configuration data and appearance data from said database , for the purpose of transmitting the downloaded data to the keyboard , where the data is stored in memories 53 and 54 , respectively . according to the invention , not only characters like letters and numbers can be selected , referring to the appearance and location . this could also be valid for keys that have other functions , like shift , alt and return . further , standard functions or actions , which on a keyboard are accessible only by means of combined key commands , can be configured on a specific key , at which only one keystroke is needed for the activation of the actual function or action . for example , a save button can be arranged and supplied with a suitable symbol . according to a preferred embodiment of the invention , a key on a keyboard is arranged for browsing between the character configurations . the activation of this browse key firstly renders browsing of the visual indicators between different configurations , i . e . a change in the appearance of the keys on the keyboard , and secondly to a change in the computer &# 39 ; s decoder , dependent on the changed appearance data , so that the scan codes are interpreted as the correct actions . the activation of this browse key consequently includes communication 62 between the keyboard and the computer . the functionality of the browse key makes it especially easy to reconfigure the key settings for the keyboard . this is especially advantageous when there is a limited number of keys , or at least fewer keys than the desired number of key functions . consequently , the browse key can be arranged to be used as the shift - or the alt gr - key . for example , in one embodiment , a keyboard could be arranged with a row of numeric keys at the top of the keyboard , as is normally the case , but where only the numbers are indicated on the keys &# 39 ; display in one mode . a single keystroke of the browse key will thereby replace the numbers with the alternative characters , corresponding to the combined activation of shift and the respective key , i . e . the characters !,“, #. additional activation of the browse key may render these alternative characters to be replaced with the next setting of alternative keys , which correspond to the combined activation of the alt gr key and the respective number key , i . e . @, £, etc . the result thereof is both that the keyboard can be made easier to interpret , since fewer characters are shown simultaneously on each keys , and also that all the keys on the keyboard can be arranged with one or more alternative keys that are clearly shown by browsing with the browse key . a particularly advantageous embodiment of the invention , arranged with the browse key , is where the apparatus is realized as a mobile phone 31 . an ordinary mobile phone has a range of 12 - 15 keys 34 , of which the number keys 0 - 9 are dominating . text input , for example for an sms message , can become both difficult and time consuming since the input of each character may demand up to four keystrokes . in a mobile phone according to the present invention , a plurality or all of the keys or buttons of the mobile phone are arranged with displays . during normal operation , when the number keys are mostly used , these keys are arranged to show the numbers only . during input of text , the browse key of the mobile phone is activated , rendering the displays on the number keys to show letters in stead . in one embodiment each key can assume the appearance of several different letters , whereby the text input progresses as normal . in another , and preferred , embodiment the number keys are reconfigured from showing 0 - 9 to show a - j at a first activation of the browse key . additional activation of the browse key renders the keys to show the letters k - t , and so on . in accordance with what has been described for the embodiment wherein the apparatus is a computer , activation of the browse key naturally also renders the action taken upon the activation of corresponding key to changes when its appearance changes . in one embodiment the browse key is realized as two keys arranged to browse upwards and downwards , respectively , similar to what already is common for mobile phones for browsing in the menu system . in another embodiment of the present invention , said control unit is arranged for controlling a number of different apparatuses . the control unit can e . g . be a central and portable control unit for controlling devices in so called intelligent homes . thus , the control unit can be devised to be able to communicate with , e . g . the tv , the video recorder , the refrigerator , the answering machine etc . in a preferred embodiment the browse button is then used for quick and easy reconfiguration of the control unit to a key set that is adapted for an apparatus one wishes to control . preferably , the control unit of this embodiment includes parts of what was included in the apparatus in the previously mentioned description of the embodiment with the computer and the keyboard , i . e . the computer itself . thus , the embodiment with one control unit devised to control several different apparatuses is equipped with an interpreting unit , a decoder for scan codes or similar that are emitted upon a keystroke . the control unit is thereby devised to adapt outgoing control signals dependent on the character configuration , whereby browsing with the browse button between the different character configurations enables the communication with different apparatuses . with this arrangement , one push on the browse button can enable the control unit to show keys that are adapted for communication with the tv - set . further browsing with the browse button causes , e . g . the character configuration on the control unit to assume the appearance of the suited symbols for communicating with a refrigerator in an intelligent home , for example the customer cart and different basic consumer goods . other advantages with the browsing functionality , when using a computer , is e . g . the capability to brows between mathematical or physical symbols , special writing or drawing characters , or to bring up a character configuration where different keys could show in a distinct visual manner a symbol for a computer program , at which the computer program could be activated by the activation of the respective keys . the functionality consequently enables a very simple execution of functions , which before demanded many keystrokes , alternatively combinations of several keys , or the use of a mouse . the invention is also usable to adapt control units in form of game consoles to game appliances like computer games or tv games . at that , different keys can be given different appearances reflecting different events , accessories etc . the invention also enables easy reconfiguration of the game consoles for different games or players . many examples of embodiments of the present invention have been described above , but many more imaginable applications and embodiments of the present invention are possible . the scope of the invention is only limited by the accompanying claims .