Showing a screen in a loop

I need to prompt the user for a set of values - one per "station." The values for each station will be on one screen in the installer. I need to allow the user to enter x-number of stations, hence show them that screen x-number of times.

How can I show the screen with two buttons "enter another" and "done entering" and (respectively) cause the screen to either show again to collect the next set of data for another station - or move on to the subsequent stage in the installer - depending on what they chose?

Also, how would I store x-number of session variables as they enter them? What's the best collection (array, list, etc.) to use for this?

Thanks,
Eliezer