I am sure sometimes you want to have a screenshot of something when at Yahoo! Pool rooms or anywhere .There are couple ways but now i will explain the easy way to have
a screenshot so you can save it for you or can send to your league admin’s if someone break a rule 
For Windows users;
1-Hit the print screen key at your keyboard when you want to have a screenshot.
2-Hit start, click on programs then accessories then hit Paint.
3-when the Paint program launch just ; hit ctrl + v from your keyboard or right click on the new blank page and chose paste.
4-Now you should see your screenshot there instad blank document, you can edit it like cropping unnecessary parts.
5-Give a name to your document and save your screenshot as a .jpeg pr any other file format now it is ready
Or you can use other advanced screen capture softwares instead basic Microsoft Paint