How to view debug information?

From: visi (zqvisi_at_hotmail.com)
Date: 04/28/04 

Date: Wed, 28 Apr 2004 17:52:06 +0800

In retail or debug ,
RETAILMSG(1,(TEXT("PDD_AudioInitialize1\r\n")));
DEBUGMSG(1,(TEXT("PDD_AudioInitialize2\r\n")));
there isnt debug messages occuring.

I have no idea about it!If I need to do something?

Thanks!