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You can modify another computer's Registry, perhaps to repair it or to do some simple kind of remote maintenance, by loading that computer's Registry. Regedit lets you do that simply; just click File/Connect Network Registry, and Regedit then asks for the name of the remote computer. You fill in the name, click OK and, if necessary, Regedit will ask for a user name and password with permissions to access the remote computer's Registry. Once Regedit is satisfied that you're Da Man permission-wise, you get a new icon under your My Computer icon and the HKEY_LOCAL_MACHINE and HKEY_USERS subtrees of that remote computer. (The others don't show up, as they're all either dynamic or are simply mappings to subsets of the other subtrees.)