Yeah.
Um , I'm just gonna go through the interface concept with yous now. Uh , first of all I'll explain what a user interface is. It's the aspects of a computer system which can be seen or otherwise perceived , for example , heard or felt maybe , or  by the human user. And it's also the commands that the user uses to control its operation and to input data. Um , there are two types of user interfaces. There's the graphical user interface , which emphasises the use of pictures for output and a pointing device , for example a mouse for input control. So that's sort of like the scroll thing we were talking about.
Oh. Okay. Yeah.
Yeah. I'm not really sure about the pictures that  maybe that's on an L_C_D_ screen.