My best use of LapLink was as a teen helping migrate a library off an old system. I think it was using NetWare 2.x with some DOS emulation for a library card catalog. Couldn't get it to talk IPX to the existing NetWare stuff (5.x) we were migrating to. But the DOS emulation was complete enough for us to install LapLink and bring over the files for the program!

I still have the yellow parallel cable and blue serial cables at my parents' house.

Also pretty sure I used the blue cable to do Command & Conquer over null modem to the next room at home before I figured out how to install IPX/SPX and get the machines to talk over the 10Base2 that was between them.