Go to Start -> On the right side of the menu click a button labeled "Games". There should bring up a list of all the games installed on your computer.
Yes. It is possible to play Windows games on Macs that use Intel processors by installing Windows on them using Boot Camp.
Yes. Installing Windows on your Mac using Boot Camp will allow you to play Windows games (subject to meeting system requirements like processor, graphics, RAM, etc...).
Apple computers, in common with most other computers, can play video games.
some games
Games will require a particular operating system to work. If the game is written for the Windows operating system then it will need Windows to be installed on the Mac for it to work. Specific Mac games are written for Mac OS X and will be labelled as such. That said it is possible to play some Windows games on a Mac without having Windows installed using CrossOver Games (See links below) which emulates the parts of Windows needed to play the game. This does not work for all games and may not work well for some games.
Yes. You can install and play games in Windows 7.
I don't think that you can.
some games
No.
A Mac does not have DOS Mode. To play games on a Mac you need a Mac OS X version of the game. Games made for the Windows operating system need to have the Windows operating system installed on your Mac to operate.
Yes they should be able to.
League of Legends!