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I have written a script that queries the registry on multiple servers looking for specific keys (dealing with iSCSI). After the query, I need to make changes to some of the keys in:

HKLM\SYSTEM\CurrentControlSet\Control\Class\{GUID}\(instanceID)\parameters

My plan is to make a Group Policy that will change this across the board.

My question has a few parts:

  1. Are the GUIDs from HKLM\SYSTEM\CurrentControlSet\control\class determined from the driver? For example, would the same GUID number for iSCSI be on all Windows boxes? or would it be the same for Windows 2008 and a separate one for 2003?
  2. The GUIDs contain different instance IDs (0000, 0001, etc). If I make the changes in every instance, would that matter?
  3. If I add the keys on systems that don't have these keys, would performance be affected?

I am sorry for the multiple questions, and if that is too many for one post, then consider this as a single, concise question:

Can I change the aforementioned keys across an entire network without introducing problems?

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Can I change the aforementioned keys across an entire network without introducing problems? The answer is always "no, you need to do testing first." –  HopelessN00b Feb 13 '13 at 19:44
    
Correct. It was an over-simplification. I am really looking for specific information on those keys I guess. I'll do some testing and post my results in an answer. –  Jeff Feb 13 '13 at 20:27

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