not sure how to describe my intention in excel programming terms, so
will resort to general logic and hope you will understand my meaning;

assume I am active in cell A1 then i need some info from another
(in-house) application,

i would like to click a menu button that does the following,

first checks to see if in-house app is already running, if yes, switch
focus to the in-house app window, if no, open in-house app and keep
focus in in-house app window.

adding the menu button is no problem, but the code that sits behind
that button....clueless!

would appreciate any help offered, thanks very much.