ImprPant image

This is an idea. I don't even know if it's possible (I'm a newfag). I've had the not solved problem of to show a screen capture of my desktop on any forum, having always to ImprPant my screen and always after create a .jpg on Paint (or something). Then, upload it to the proper site.

Is it posibble to get a capture and paste it directly in the comment section of the reply page on the boards?