Getting list of computers policy assigned to

Hi,

In the SMP you can look at a policy and very quickly display a list of all current computers (or Users) the policy is currently applicable to. I'm trying to write a report that basically does the same thing. i.e. Tell me for this policy, which computers it currently applies to and the easiest solution here would be to use the SQL query which provides this in the policy display.  Why? Well I need to check all the agent plug-in policies to see which computers are still in the policy list and therefore establish which agent installs may have failed.

Anyone got any clues/pointers

Cheers

Steve