How to check whether PowerExchange Listener is running or not from PowerExchange Navigator?

It can be checked using DTLREXE utility.

c:\Informatica\PowerExchange9.1.0>dtlrexe loc=MainFrameDEV prog=ping
PWX-00750 DTLREXE Input LOC=MainFrameDEV, PROG=PING, PARMS=, UID=<>.
PWX-33304 10.*.*.*:* : taskid: 0, operation timeout: (none) secs, heartbeat interval: 30 secs
PWX-00755 DTLREXE Command OK!

Pick up the loc from dbmover.cfg.