I remember labs full of networked Win 98 machines in middle school, with like Novell software on them for login credentials and whatnot. The computers sat there with a login screen and when students logged into it you would be presented with the Office suite and a restricted web browser and some educational packages. A lot of normal Win 98 stuff wasn't there though, like any settings menus. But there was some convoluted way where you could bring up a help text and then by navigating deep in the menu system somehow cause it to launch to a "normal" Win 98 desktop.