You could try typing
in the console and doing the same to the process number there. Not sure right enough :S
If you don't start a process, job, application, etc. from a command line, 'jobs' won't print out the process id of an application. If you start the job or application from a command line and run it in the background per the '&' command, then jobs will print out its process id, ie.,
root@linuxbox $ openoffice &
Running 'top' is another alternative. And then kill the pid with a 9 or 15 and that should do the trick. kill -l will list all the available kill signals.
Or just pull the plug on the computer and then plug it back in. Don't forget to turn it on after plugging it back in.