Re: kill user manager
It might have been easier with a "ps -ef", which gives the full format listing with the command and options.
Alternatively, to close a window forcefully you can try "xkill" and point to the window.
Xkill causes the X server to close the window, and presumably the application will then exit. This is not guaranteed, as many applications do not properly use the events - and keep trying to send data.... sucking up 100% of a CPU in the process.
When this happens I use "top" to see what is the pig, and if it is my process, I can kill it then (k, and it will prompt for the process id, then what signal to send - I usually use 9).