I am concerned that if you add a Locum Tenens as a user, you may be liable for payment of the Locum Tenens. That is assuming that AC can phone back information and tattle that you have established another user on its database. It is my suspicions taht AC has some capabilities to "phone home".

This is what I do.

I have the Locum tenens sign on as if it is me.
In the chief complaint section I create a template: "SEEN BY Dr. L. TENENS" to mark that L. TENENS had seen the patient on the chart. I instruct the Dr. Tenens to leave the note in my mailbox. I review the notes carefully and add at the end of the plan section that "This evaluation/visit was performed by Dr. Locum Tenens who covered for my practice from 2/1/08 to 2/4/08. My electronic signature signify that I reviewed this chart note."

I make this into a template, too. If the Locum wishes, he or she can affix his/her signature on a paper copy.

Hope this is helpful.