Stopping and Running process on the fly with Solaris/OpenSolaris

Solaris/OpenSolaris has two utilities called pstop and prun which has ability to stop a running process and run it again. Both of the ulities takes pid or pid/lwp (light weight process - thread) as parameter. As the name says, pstop stops a running process when given an pid of a process. Given the same process id of a stopped process to prun , makes the process runnable again.