Definitely +1 for LapLink. Sure it required a null modem cable, but at least it beat sneakernet! QBASIC that came with DOS. The built-in context-sensitive help

Definitely +1 for LapLink. Sure it required a null modem cable, but at least it beat sneakernet! QBASIC that came with DOS. The built-in context-sensitive help is how I taught myself how to "program". Also, Norton Commander and Norton Disk Doctor. In the bad old DOS days of no tab-complete and dodgy floppy disks, Peter Norton was a hero.