AIX definition of maxuprc

There seems to be a good deal of contradiction about what maxuprc means in AIX5.2

My understanding is that this is a firm limit of processes per user ID on a system. e.g. If a user is logged on twice, the total number of processes owned by that user ID across both sessions is maxuprc.

My colleague says it is a limit per session. e.g. If the user is logged on twice, then that user ID can have 2 * maxuprc running in the system (up to maxuprc per each session)

Can anyone clarify?