Here some notes about the usefull command line.
If you have a process that is using a high amount ofthe resources, as CPU time or memory, some workaround is to find which files/drives is using. Once you'll have the PID (you can get it from task manager) just query it using Tlist:
Tlist PID
Ie> Tlist 1885
It will appear the path that started the process and some files associated.
For getting a list of the current process just run:
Tlist
Tasklist