Their is no way to do that. except if you delete the user an recreate it
**ADDED 02/06/09***
Actually, that is not an accurate statement, if I understand the request properly. If you mean, you removed the USERID attachment from someone's person record and now you want to put it back that is. If so, the code to do this is not very difficult, but it can be done using LotusScript fairly easily, and it will look just like when it was removed. The issue is really a matter of why you would want to. From a security standpoint this is obviously a bad idea. If however, you really want to do this, and my understanding of the issue was correct, I can assist with the necessary code to add the ID file back into the correct person record.
***END ADDITION by SlikTool - mkinder@acadiasolutions.com***