On our trade floor some of our users have Bloomberg boxes, others use
Reuters. Each of these tools comes with an Excel AddIn to allow you to
retrieve real-time prices into a spreadsheet.

What I would like to do is write a macro to write in these formulas. In
theory this is easy, but there is one "trick", knowing whether it should
write a Bloomberg formula or Reuters one.

Is there a way to easily check for the presence of a known (by name) AddIn?
That would make this task fairly easy.

Maury