From the NannyMUD documentation

LAST CHANGE

2000-12-28

FUNCTION

NAME
        traceprefix - Set the prefix for objects printed during a trace.


SYNTAX
	string traceprefix(int prefix)
	string traceprefix(string prefix)

DESCRIPTION
	Sets the filenameprefix for objects that should be printed in trace.


NOTE
	Use this with caution as it is severly punishing on execution speed.


SEE ALSO
        trace in efun/debug/trace