Harrah's Total Rewards question

[DeuceHigh13]

I did a search and didn't see this question answered in any of the Total Rewards threads.

I have multiple Harrah's Total Rewards cards (all with same number). If I go AC with my girlfriend, can we both use one of my Total Rewards cards simultaneously while playing slots or video poker? I'm just wondering if Harrah's has a system in place to prevent a single Total Rewards number from being used simultaneously in multiple locations.

In my case, I don't see anything wrong with it, because we are both playing with money out of my wallet.