Because you may receive messages that refer to users by UID rather than by username, it is important to know each user's UID. But if you are using a PMDB and you pay no attention to how your new users' UIDs are assigned, the users may receive different UIDs on each subscriber machine. It is best to ensure, instead, that you can depend on each user to have the same UID everywhere; and the same is true of GIDs. See UID/GID Synchronization in the Endpoint Administration Guide for UNIX.
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