computing called-by

Dear LispWorkers,

I am just wondering, whether there is a way to use the functionality of 
the function call browser without the GUI.

I have come about this function:
LISPWORKS-TOOLS::FUNCTION-CALL-BROWSER-WHO-CALLS <self> <fun>

But I do not know what to pass as self.

Any hints? I would appreciate your help.

Cheers,
	
	Peter