UI Testing for multi screen setups

I was wondering if there was any tools/ systems, that are capable of simulating multiple screens for use on UI testing.

Context: We are developing an application which can consist of multiple windows, depending on the user setup. We would like to test (manually) such setups with more than 2 monitors, even if the developer/ tester only has 1-2 monitors. We do not need to automate this testing. Being able to view it from time to time when we make larger UI changes would be sufficient.

Thanks.