[ubuntu] 12.10/64-bit - using xtrace

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http://ubuntuforums.org – I've been trying to work on something for another poster in the forum and as such finally got to where I found about the program xtrace to see the "conversations" between the x server and the x client. Unfortunately, even after reading the man page, I can't get this to run in a way where I get any data. I've tried using the -o option and specifying a file name, yet that file is always empty. Any guidance would be greatly appreciated. (Hardware)