There was a trackball integrated into the case. Some buttons on the keyboard acted as buttons for the mouse cursor.
One of the most popular programs on these computers was a program called FGED. It would save animations that could be played back later. Some people would spend hours creating them, then later play them back for their friends.
Later version of the ICON supported DOS games. I remember playing "scorched earth": https://en.wikipedia.org/wiki/Scorched_Earth_(video_game)