This can actually be useful for tracking the operation of the HL engine, as well as that of a particular HL game mod. Trace level for dllapi routines. Enable unlimited trace logging. Not currently used.
Case is insignificant.
Show the routines being traced. List the various routines that can be traced. Note the information it logs on each routine invocation is, at the moment, relatively minimal. I'd be interested in knowing as well, for adding it to the distribution code.