Can someone tell me are global values only useful in single user installations?

If a record  identification number is saved into a global value to be used to automatically update a field in a subform if more then one person was doing this type of task with different clients would not each person end up with the same record  identification number incorrectly?

What is the correct method for transferring a relational identification number from the parent record to child record in the subform?

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Extremely. They allow resources and information to be shared globally across both forms and users. They provide an extremely simple and flexible lookup mechanism that can store a variety of information that is globally available. If anything, they are more valuable with multiple users because it gives those users access to the same information, and they stay "on the same page". They can also serve as communications vehicle between users.

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You could use two GlobalValues: one that gets set to indicate that a user "owns" the other one, and the other one that holds the "identification" value. When you need to transfer the "id" check the "owner", if it is set - wait for it to be cleared, then set it, transfer the "id", and clear the "owner". Given that the transfer is likely to be very brief, you could put some sort of timeout on the "wait".