If you use "restart in MS-DOS mode" from Windows 95/98, and then EXIT from the resulting shell, you get "Windows is now restarting..." and it does an unclean Windows boot with your TSRs, mouse driver, mscdex still loaded.

But, if you've loaded SMARTDRV while in MS-DOS mode, the machine fully reboots instead.

So, a handy trick is to have smartdrv in dosstart.bat.