IBM3 or IBMjoke is intended as an insult to the user-unfriendliness of the
IBM computer operating system.
When you start it it will seem to crash your Amiga but follow instructions
and you will soon find yourself facing a typical IBM/MS-DOS amber screen.
Try typing IBMish commands and you will be presented with nonsensical
replies.
Unfortunately, one tires of this quickly and the author provided no
documentation so there is no known way out. You can of course leave the
silly thing running and get to your Workbench screen via the
left-Amiga/N command. If anyone does find a way to cancel this program
let me know.