the present invention allows a set of computer graphical user interface ( gui ) elements to be embedded within a number of applications on the user &# 39 ; s desktop , or within a taskbar which is part of the computer operating system . these gui elements are updated appropriately when a user &# 39 ; s communication session status changes . fig1 illustrates the key software components involved in implementing the present invention in the preferred embodiment . for purposes of this discussion , we assume that the operating environment of the present invention is similar to that of the integrated telecommunication collaboration system ( itcs ) described in the incorporated application . the arrows in fig1 indicate visibility of the software components to other software components . that is , a component is visible to any other components that are pointing to it . state persistence agent 105 in fig1 is a running executable that is able to receive requests from the other software components and update toolbar buttons so that they reflect the state of the communication session . communication agent 104 is responsible for synchronizing the various agents which are directly responsible for the various components of a communication session . in the preferred embodiment these are a data agent and the voice agent which are not shown for simplicity . in the preferred embodiment , communication agent 104 makes available an interprocess compliant interface allowing other applications to make communication requests such as place a call , release a call , share an application , collaborate on an application , etc . integration agent 103 is the component responsible for integrating communication capability directly into a specific set of computer desktop applications as well as into an operating system interface . integration agent 103 processes user input and makes the appropriate communication requests of the communication agent 104 . for each application , an application specific macro 102 is run when the application starts . this application - specific macro uses the integration agent to register the application and each of its buttons with the state persistence agent . the application - specific macros are triggered when the user interacts with the embedded toolbar buttons . the application - specific macros make use of the integration agent to perform actions requested by the user . the integration agent 103 then makes requests of the communication agent to initiate calls , share applications , etc .. it is also possible to have computer gui elements integrated into the operating system interface . in the preferred embodiment , as shown in fig1 taskbar gui elements 106 are present in system application tray . state persistence agent 105 controls these gui elements directly . the graphical user interface of the present invention is used to control a communication session which can include a voice call and a data call which are associated with each other and are together referred to as a “ harmonized ” call . in the preferred embodiment the data call is implemented by a data agent which implements a multimedia data communication protocol such as that described in the international telecommunication union ( itu ) standard h . 323 . the voice call is implemented by a voice agent which preferably makes use of the public switched telephone network ( pstn ) in order to provide high - quality voice communications . the data agent communicates the current status of the user &# 39 ; s data connection to the state persistence agent 105 through the communication agent 104 . the voice agent communicates the current status of user &# 39 ; s voice capability to the state persistence agent 105 through the communication agent 104 . the voice agent may receive this information from a third party pstn call entity such as a computer telephony integration server ( ctserver ). the voice agent may also receive this information from a first party pstn call entity such as a tethered device , that is , a telephone device which is connected directly with the user &# 39 ; s personal computer . a key advantage of the present invention is that gui elements are dynamically updated to reflect the current status of a communication session . the communication agent 104 monitors events from the voice agent and the data agent . when it receives an event it communicates the updated state to the state persistence agent 105 , which updates the state of all appropriate gui elements in all currently registered applications . these gui elements are , in most cases , buttons with icons . for example , a telephone icon with the receiver hung up can change to a telephone icon with the receiver laying next to the telephone if a voice call is already in progress . alternatively , a button to share an application can be dimmed when the function associated with the button cannot be initiated . fig5 illustrates an application with a toolbar 501 containing gui elements which are used by the present invention . the buttons labeled “ share this program ” and “ collaborate ” are dimmed indicating these functions are not currently available . fig2 illustrates the application registration messages which are transferred among the various software components which implement the invention . an application starts at 201 . this application start is detected by an application - specific macro which seeks to register the application at 202 with the integration agent . the integration agent then registers the application with the state persistence agent at 203 . the state persistence agent then sets the appropriate state for gui elements within registered applications at 204 . fig3 illustrates the process of updating gui elements in response to an action initiated by the user . in this example , the user presses an initiate call button . the button is pressed at 301 and the application - specific macro notifies the integration agent to initiate a call at 302 . at 303 , the integration agent checks with the state persistence agent to see if a call is already being initiated . assuming the answer is no , the integration agent notifies the state persistence agent the call is being initiated at 304 . the state persistence agent then disables the initiate call button to accurately reflect the status of call initiation . fig4 is a more generalized example of a software message flow diagram which illustrates how multiple gui elements can be updated in response to a notification that the status of a data call which is part of a communication session has changed . at 401 the communication agent notifies the state persistence agent that a call status update is required . in this example an initiate call button must be disabled . the state persistence agent disables this button at 402 . the state persistence agent also updates a call status indication button at 403 and enables a share button at 404 to indicate that the data call can be used to share applications . once sharing begins the state persistence agent changes the share button to a depressed state , indicating that the current application is being shared , at 405 . fig6 illustrates one example of a network environment in which the present invention is used . on the right side of fig6 is shown user 2 , 601 , whose telephone is interfaced directly to a public switched telephone network ( pstn ) 605 . additionally user 2 has a personal computer workstation which is interfaced to both the pstn and a point - of - presence 602 for an internet service provider ( isp ) via a conventional modem 606 . the personal computer workstation contains the software which implements the present invention and displays the appropriate gui elements . the ctserver 604 is connected between the pstn and the isp point - of - presence . in the preferred embodiment the server is connected to the pstn via a primary rate interface ( pri ), which is a well - known part of the integrated services digital network ( isdn ) standard . the connection to the isp point - of - presence is made via either a ti , t 3 , or tcp / ip interface . the left side of fig6 is similar to the right side . however , user 1 , 610 shown on the left side of fig6 is using a digital subscriber loop ( dsl ) to interface the desktop computer to the pstn and the isp . the digital subscriber loop can also be used to interface telephones into the networks . dsl modem 609 provides the interface point for both the desktop computer and a dsl telephone . the desktop computer used by user 1 includes the present invention . in addition user 1 , 610 , has available a conventional telephone that directly interfaces to pstn 607 . ctserver 608 works essentially the same as ctserver 604 . according to fig6 user 1 is served by one local exchange carrier ( lec ), and user 2 is served by a different lec . the two pstn &# 39 ; s are connected via pstn trunks . additionally , the two internet service providers 602 and 611 are connected via the public data network 603 . in the preferred embodiment the public data network is the internet . it should be noted that although fig6 shows one example a network environment in which the invention can operate , there are many other alternatives . indeed the public networks could be replaced by privately owned networks . is also possible to omit the ctserver if a first party is supplying status information to the voice agent which is being used by the present invention . fig7 illustrates a personal computer workstation on which the software which implements the present invention can be operated . input output ( i / o ) devices such as keyboard 702 , mouse 703 , and display 704 . the display is used to show an operator a computer desktop on which various information is displayed . such information includes the gui elements of the present invention . system unit 701 is connected to all of the i / o devices , and contains memory , media devices , and a central processing unit ( cpu ) all of which together execute the client software of the present invention and cause the various agents and software elements of the present invention to operate when the invention is in use . a network interface is normally implemented via an adapter card however for the sake of simplicity the shown graphically as interface 705 . as previously mentioned , appropriate computer program code in combination with appropriate hardware implements most of the elements of the present invention . this computer program code is often stored on storage media . this media can be a diskette , hard disk , cd - rom , or tape . the media can also be a memory storage device or collection of memory storage devices such as read - only memory ( rom ) or random access memory ( ram ). additionally , the computer code can be transferred to the workstation over the internet or some other type of network . fig8 illustrates one example of a media . fig8 shows a diskette of the type where magnetic media 802 is enclosed in a protective jacket 801 . magnetic field changes over the surface of the magnetic media 802 are used to encode the computer program code . in this way the computer program code is stored for later retrieval . we have described specific embodiments of our invention which provides graphical call status for a communication session which uses a desktop computer . one of ordinary skill in the networking and computing arts will quickly recognize that the invention has other applications in other environments . in fact , many embodiments and implementations are possible . the following claims are in no way intended to limit the scope of the invention to the specific embodiments described .