Interpret the theme "windows" in whichever way you want, whether it's metaphorical windows or actual windows in the fic. Just somehow include the theme in it! Go HERE for the rules, and be sure to read them! It includes the directions on how to submit your entry(ies)!
The contest starts today, and ends on Sunday, September 10th. Submit as many fanfics into the contest as you want until the deadline! Mods are allowed to submit entries as well, since voting for the winners is done by the entire community.