There is no way native to win 95/98 to kill a process. I do know of a command line utility called kill.exe that will let you kill processes in NT but I'm not sure it would work with 95/98. E-mail me if you want it and I'll send it to you.
Since WinNT's "kill" requires a process id number, even if the program works on Win9x, there'd be no way of determining which processes you'd be killing except by trial and error.
You'd have to be awfully lucky to kill the right process, and while guessing at processes IDs, you'd probably kill something that kills windows in the process.
There is another Resource Kit took, TLIST.EXE, that will list all running processes AND their PID. So, you could get a copy of TLIST, run that, and then you would have the PID of the application you want to stop. At that time, run KILL.EXE with the correct PID.
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How to end a program by command-line