I know of no way to launch a copy of FileMaker Pro and determine its license code. I believe that is by design to make it a bit harder to distribute unauthorized copies of the software.
What specific issue are you having? (Maybe it has nothing to do with your license codes.)
yves van dijck,
Thank you for your post.
To resolve your issue, a specific error message would be helpful. There is a knowledge base article on License Keys at: http://help.filemaker.com/app/answers/detail/a_id/6203, and that may also assist you.