dual boot

[Rinaldo]

Hello
I am new to Linux and have a few questions.
1. I dual boot with default windos98/dos and fedora 2.
2. How can I change this default from time to time? Can I do it from within
winn98/dos or Fedora 2?
3. Can I switch from within win98/dos or fedora2, to the o/s I wish to use?
4. Or can I make a floppy and boot from it and then make a dicition to witch
o/s I wish to use?
Regards
Rinaldo.