Trigger macro from outside excel environment

[Remya]

Is it possible to trigger macro from outside excel environment? My requirement is to take screenshot of citrix application when we click on it.

 

[Johnny C]

Do you mean, trigger an Excel macro from an external application or trigger an external macro to take a snapshot of the screen?

If the latter have a look at this:
https://officetricks.com/print-screen-save-as-image-file-attach-to-sheet-automate-in-vba/

or this
http://www.vbaexpress.com/kb/getarticle.php?kb_id=1075

or this
https://www.experts-exchange.com/questions/28256175/Save-image-to-disk-from-clipboard-using-VBA.html

You might find something useful there