ok... i don't know what gmc is, so i'll assume that it's a mandrake-specific prog. but, it's not at all unusual to have a large number of processes running under the same program. mingetty, httpd, and a few others run many processes simultaneously. it's usually not a concern. however, if you feel the need to kill a process, do exactly that : type
at the command prompt, and the computer will spit out a bunch of processes with their number names. refer to them by the numbers using the kill command :
that should do it.