Using WDS system in Outlook

I need to send two (2) applications so that when one is selected the other one reacts.
I want a calendar outlook (populated in one application) to keep posted if a person is selected from a file (based from other application).
I have been thinking to do this for sometime and have hit a dead end as the existing information/knowledge is not adequate. I don't know how to use the WDS system to send the two applications or how to make the action essential to do this. Where will I’ll be connecting using the person UNID.
Any help will be highly appreciated.
