I have a 4 GB USB Pen drive. I made three partitions on it. I want to install three OS's on the three partitions, Slax on the first partition, damn small linux on the second and puppy linux on the third partition. Can this be done? Can 'GRUB' be installed on the first partition of the pen drive so that all the three OS's are exhibited on the GRUB boot screen and one can boot into a OS of one's choice? If there is a tutorial available on this, please give the URL. Further, I want to do this from Linux environment only. I have RHEL 5 and Ubuntu on my system.
Thanks in advance.

Yours friendly,
V.Sesha Talpa Sai.

This should be possible with "chain loader" feature in Grub. You would set it up the same way as you would any dual boot system. Chain load means that the Grub does not start the kernel but simply passes the control forward to next boot routine. In this setup you would have two boot screens. First select the system and then the selected system shows its own grub boot screen. Sorry, no tutorial link. Grub manual should help a great deal though.

BR,
AnttiM