But it is a external exe file...
And since Rainmeter can do OnUnfocusAction it should also be able to focus it's skins natively, right?
Much like the !Zpos bang is formulated, the focus bang could look similar to that.
Or just [!Focus] if same skin.
Where i know the focus bang would be beneficial are menu based skins.
So when you open the menu(MouseOverAction), and did not click and item, but rather outside of the skin,
The skin could take the appropriate action.
Which would most likely be to close the menu for you.
In my particullar case i have made a launcher skin which is always hidden until you mouse over one of the menu items.
The skins Zpos is set to 1 so it overlaps other windows, but it also needs focus so when you click away it unfocuses and hides the skin.