I'm not familiar with the term 'GxP Mode' and googling it I can't find any obviously relevant references. Perhaps others know, but is this a windows setting you are talking about or something entirely different? Perhaps a screenshot of the setting might assist?
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Are you possibly looking for computers that are not set to "autofix" when scanning for patches? If so and all of these computers should have the same Scan and Repair settings then you should be able to create a query.
I'm sorry but yesterday I forget to reply at this post.
The sub-voice GxP_PC is in the menu "Custom Data\Landesk\GxP_PC"