I need help typing characters not on the keyboard. In Windows, I did this by holding ALT, typing a sequence of numbers on the numpad, and then releasing ALT. I cannot figure out how to do this in Linux. Is there a way?

Edit: Great, I seem to have enabled something that uses the quote button to type them, but it´s too limiting for normal typing. Is there a way to turn it back off now, maybe an easy way to toggle it? Reversing the option back to what it was didn´t seem to do anything....it looks like it´s stuck on, which is a serious problem, as I can´t seem to even type double quotes now...

I don't know...but....
maybe there is way to do it in the Control Center
Mine (Xandros) has it under
General settings -> Shortcut keys

Sheng-Chieh