Windows 2000 and windows 98 on same pc??

Hi everyone
I keep reading about dual boot. Does this mean I can install 2 operating systems on my pc.
Right now I have windows 2000 on a pc which works great with autocad and other programs, but our version of Lotus Notes does not work on windows 2000. I was originally going to remove the windows 2000 and install windows98 , but if I can have 2 operating systems, maybe he can work all programs except Lotus Notes off win200 and use the windows 98 for lotus notes..does anyone know if this ispossible.
Thanks
Claudette