You obviously aren't are a true Dos master (heheh); he's referring to the Menu system you could build into CONFIG.SYS so that when your PC booted, you got a menu just like that Windows boot menu, but user defined. Back about 7-8 years ago (damn ... have I really had a PC that long?) I had one in my config.sys that was something like:
1) Normal boot
2) Games setup (high memory config)
3) Windows boot (didn't load dos drivers, booted straight into Win3.1)
You could basically, if you were devious enough, set up totally different Config/Autoexec commands to be executed depending on which startup option was selected ... it was a pretty nifty feature, actually; if you knew how, it took a lot of the memory management hassles out of dos. Of course, that's what made dos interesting
