Thank for the reply Pierre, I did some search on the net and found out a page about TraceAPI plugin at Metamod.org and a log_plugin.cpp inside your singlep src, thats all I can found but not other document about this, the TraceAPI plugin page is too hard for me, I think only Metamod plugin coder can understand, and I can't find where to download this plugin also(or is it already build-in in metamod ?)

Pierre could you tell me a little bit more detail how to use it please, sorry for your time. :o