If gOS (or rather the ubuntu linux gOS is based on) has built in drivers for the hardware you want to add, gOS will autodetect it during boot, and will automatically add (or rather "use") the needed drivers for it to work.

But you better check the lists you can find on the ubuntu sites to check if a Linux (ubuntu) driver is available, the hardware manufacturers sometimes simply don't care to write Linux drivers, especially for WiFi modems.

gOS (all current versions up-to gOS 2.9M) are based on Ubuntu 7.10, so if Ubuntu 7.10 supports the hardware, gOS should (in theory) do too. The ubuntu site has lists of compatible hardware.