Thanks WildDreamer, 
My problem was I had an old Winbook FX which had had the BIOS passworded, and now no one knew the password. (and yes, it was legally purchased from someone I knew well!)
I followed your lead and checked out the site below:
http://www.esiea.fr/public_html/Christophe.GRENIER/cmospwd.html
I downloaded the program cmospwd and used it thus:
Booted the computer (Winbook FX) to DOS with a floppy containing just Command.com
switched to a: drive and typed cmospwd /k (hit enter), then selected option 1 (enter again).
Rebooted computer and hit F2 to get into BIOS. I was allowed in with no problem at all. Previously it had demanded a password.
Success!!!!
(A universal password with early Phoenix BIOSes, was simply phoenix, and if you couldn't spell it, there it was at the top of the screen....nothing like security is there? However the BIOS I had (Notebios 4.0 dated 08/27/96) was clearly not early enough as this did not work.
The computer on rebooting gave some comment about CMOS checksum error, but a quick trip through BIOS followed by saving the settings sorted that out.
Thanks for your help.