Setting an active Window

[Anonymous]

Hi,

I'm trying to figure out a way to set a view port/render window  active so I can createScreenshot() from it without clicking on it. I know I can click on the view port and call createScreenshot() and it will get an image from that, but I want to be able to script the screenshot and active viewport. Is there a command that I skipped over looking through the docs?

Thanks,

~Zach