External Software Auto Login

Hello

I work for a software house that designs bespoke systems and we are wanting to use wordpress to run our knowledge base system.

You have to login to our software as a user and we wanted a way to beable to use this to pass on the login details to wordpress so that we can close the knowledge base off to public and it can only be accessible once you have logged in to the software. Or atleast been logged in at some point.

This way we can track what users are looking at what help files which will allow us to better understand the support we need to give that client.

Any help on this would be most appreciated. We was looking at cookie authentification but not sure on the process.

Thanks in advance.