I want to change some general colors or brightness of the windows OS, all the desktop and opened aplications. Its possible to do this in construct2? Is there a plugin to do something like this?
C2 allows you to configure the colour scheme for the Event and Layout views from the Preferences dialog box (https://www.scirra.com/manual/61/preferences). Is this what you mean?
I think they mean they want a plugin or to build an application that will do that
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No... I want to change the colors of entire Operating System. I need that all the computer comes dark for 2 seconds.
Have you thought about making...whatever it is your building, full screen and having it flash black for 2 seconds?
Yes, but it dont work for me. I need a blackout for a seconds while third party apps open and close behind my game. In some circumstances the windows graphics appairs over the game, and for that reason I think that the possibility of change windows color scheme to dark is the best option to hide all windows operations.