in the bunker where you get knocked out by the gas to start dead money in the room where the vending machine is there is a terminal with a message for veronica how do i get that message to play or is it not suppose to play at all

Give it to Veronica.

I don't think it's suppose to be able to play for you to hear it.

is it possible to give her a holotape

Exhaust all the speech options regarding Elijah then you can say you found him

Not "open-her-inventory" give it to her.
Talk to her.
http://fallout.wikia.com/wiki/Veronica_Santangelo