I am not sure if that's doable. I believe once pageOutput is set to true in the config, the only way to not show it on a specific page is either you set the localOnly to true (but it will still show on the server) or completely turn off tracing for that particular page by doing what I mentioned before (Trace="false").
One option you can choose is to turn off pageOutput and leave Tracing on in web.config, and then on a different browser (even on a different machine), you can invoke the trace.axd from the root folder of your site / web application and you'll be able to see all the traces coming from any machines that are using your site.
i.e. http://mywebserver/trace.axd
For advance ASP.NET tracing and debugging tutorial, watch the screencast in this post by Scott Hanselman.
Jimmy Chandra
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