Are users using laptop monitor or larger monitors?

I know this is a stupid question and I apologize but maybe you can tell me if this is even doable/knowable.

My Windows .NET application is for our internal use only and some of the users run on a laptop, others on a "desktop". I personally go back and forth depending on if I am home or in the office. The thing is, I always use my laptop but at home it's standaone and at work it's docked and I have two big, beautiful monitors to display my application data. But it's still a laptop I'm using.

My boss wants some of our forms to be "regular sized" for laptop users and larger for the desktop people who have the real estate. I don't know how to determine this. Can I? Right now I am coding for the least common denominator and that takes away from what the desktop/large monitor people could be able to see if the forms were presented larger.

Thanks if you have any suggestions!