Group policy and software assignment

Ok gang. I am pretty sure I already know the answer here but I am coming to the well so I can be absolutely sure. I have a meeting today and want to make sure my facts are 100% acurate.

I can assign an program packaged as an msi file to an OU and have it load with no user intervention. Correct? Further more once it loads, it will not continue to load every time a user logs in. Yes?

Thanks as always