I have two users on the network.
One is John Smith. The other John Smith Jr.
How do you as a sys admin set these two users up so they do not conflict in AD(active directory) and or FileMaker?
Just make sure they have different usernames, and you'll be fine. The First/Last name values aren't used for authentication purposes.
Does your filemaker instance authenticate off of Active Directory? If so, the your problem is solved. If not, like AD, just give them unique usernames.