From Support

Our system test will allow you to quickly and easily test your system for compatibility with InstantPresenter.

The system test can be found at www.InstantPresenter.com/systemtest

The system test is fairly accurate, however as modern web browsers continue to evolve, it is possible to receive some false negatives while using our system test. The most important item being tested is your ability to connect to our servers. If this test passes then you will most likely be able to participate in a webinar.