It's a button on your keyboard. PrintScreen. PrtScn is what it is sometimes abbreviated to. 

Windows Vista/Windows 7:
C:\Documents and Settings\<Your Windows Username>\Local Settings\Application Data\Ironclad Games\Sins of a Solar Empire\Screenshots
or
Windows XP:
C:\Documents and settings\<Your Windows Username>\Local Settings\Application Data\Ironclad Games\Sins of a Solar Empire\Screenshots

have to have hidden files shown

give thanks to Microsoft for the idiocy

How about if i wanna take a screen shot of my desk top, and not the game...i have XP, and will have it till im forced into another Windows operating system lol..

ok...just got irfin.....now, i hit print screen, where does it go???????????????? omg.....i was doin this 15 yrs ago and it wasnt this complicated, used to take screen shots of my Rogue Spear stats....

?? ... if you are talking about irfanView

Menu Options/Capture

Pick Full Desktop area

Press start button

Ctrl+f11

The screenshot will load into the program ... Save it

Thanks Lightstar....that's how i used to do it, just been a very long time. I knew there was a simple way

Any ideas on why i lost my sound? lol....was working last nite, now nothing.

http://www.sharewareriver.com/download.php?id=5344  Hey go to this site and down load this program. It will take a Picture of your computer screen or what ever window you may have open. it is virus free with out ny spy wear..  I use it on 3 laptops and one home computer.. It works Great..

If you need an easy to use screenshot app that is also free, check out Jing.

http://www.jingproject.com/

Yeah, it's very popular with Stardockians and TechSmith (the company who makes it) are good friends to WC and have helped sponsor the GUI Champs in the past.