How can I right click on a Mac using only the trackpad in a dual-boot environment?
If you have a MacBook Air you can "right-click" by placing two fingers on your trackpad and clicking with one of them. Of course this work when you are using OS X.

You can configure this option (if it isn't already configured) by going to Settings > Trackpad > Secondary click

If you are using Windows with Boot Camp instead, you should install the additional driver provided by Apple. They should allow you to right-click in the same way you do it on OS X.