NAME
	previous_program - return the previous program

SYNOPSIS
	string previous_program(varargs int n)


DESCRIPTION
	Return the name of the object with the function n+1 (default: 1) steps
	back in the function call chain.  If the number of steps is larger than
	the number of function calls involved, nil is returned.

SEE ALSO
	kfun/previous_object, kfun/call_trace
