Now why didn't you say that in the first place?

Knowing that the form is in a different application changed the whole scope of the question you have asked.

What you are doing now is simply trying to find what "Windows" your operating system currently has open. A form in another application would be listed in exactly the same way as Microsoft Word or any other application you are running.

There are examples on here regarding this.

Do a search for "FindWindow" and it should lead you towards what you are needing.