From the NannyMUD documentation

LAST CHANGE

2000-12-28

FUNCTION

NAME
        trace - Let a player get trace information.


SYNTAX
	int trace(int bitflags)

DESCRIPTION
	Sets the trace level for the current player. As long as this player
	is current the gamedriver will write trace information. This can
	be very excessive information. The bitcodes are as follows:

		  1 - Trace all calls
		  2 - Trace all call_others
		  4 - Trace all returns
		  8 - Write arguments when tracing call / call_other
		 16 - Trace stackcode execution (VERY MUCH INFORMATION)
		 32 - Trace code in run in heartbeat
		 64 - Trace all applys
		128 - Write objectnames when tracing


NOTE
	This can most often only be used by some high level wizards in a mud
	for reasons of efficiency. This is implemented through the master
	object

	When very much information is printed it most often gets discarded
	because the socket can't keep up.


SEE ALSO
        traceprefix in efun/debug/traceprefix