Hi all,
I need to know , what actually happens if two people log in to SF at the same time?  My guess is that they would share the back end session so it could get very confusing because they could edit the same record at the same time.

To prevent this happening (apart from just telling people not to share username/password) is there any way for a session to know that it is already logged in?  Something like a "isLoggedIn" variable?

Thanks in advance