My goodness! Those have got to be the quickest replies in the history of I don't know what?!
Anyway, thanks guys, so it looks like any issues will just be apparent if they exist, no harm to be done then. Actually, the Unicomp is USB and the Dell is PS2 via a USB keyboard/mouse converter, the Dell does have the occasional freak out where I need to unplug and replug and it's fine but it does that even if it's the only keyboard plugged in. About once a week so no biggie.
Jamie