Selecting appropriate and cost-effective software. Wiring and configuring computers in a network. Training teachers to use computers to effectively satisfy pedagogical goals. Dealing with copyright issues of converted analog material and site licenses for software. Digital files rewind faster.
Digital audio is much cheaper.
It's generally easier to obtain copyright permission from publishers for digital conversion of material than making multiple analog copies. The time you have to use an application between launching it and having it freeze up. The small boxes that appear on screen when you choose the wrong command. The movable and resizable box that contains an application's controls and input. The clickable area on the screen.