I tried looking for this subject on google and on the man pages, but nothing was about it. So it's a subject so simple it doesn't need to be discussed, or just no one really cares(?). Whatever it is, any answer would be very helpful.

Sometimes I like doing some gaming, so at the school's terminals (Solaris9), or at home (Debian Etch), I play quake, use snes emulators, etc. Anywhere I try, I have the same problem.
The thing is I press like, 3 or 4 keys at the same time, but for some reason the third (and forth, etc) key is ignored. As you can image this situation is very annoying. And I just can't figure out how to change this configuration (or whether it is possible or not).

Anyone knows how to make it possible to press multiple keys at the same time without getting them ignored?
Any help or advice would be very thankful.

Hi, from what I've heard (and experienced) the number of keys you can press at a time depends on the keyboard itself, thus of the manufacturer. The quantity of key that can be pressed at a time is something that is regarded as a sign of quality in keyboard reviews.

My advice is : read keyboard reviews on the net...

Serafean

These limitations are a big reason why computer gamers tend to map controls to "shift", "ctrl", and "alt" (and they tend to be annoyed at the "windows" key since it's too easily accidentally pressed). Even low quality keyboards are guaranteed to handle shift/ctrl/alt along with at least one more keypress.