HELP with Mac

i dont really use macs but i;m on one right now and one of the programs has frozen.
What do i need to do to close it?

This Video Will Tell you all you need to know:

http://www.thehoucks.com/happynowhere/Apple_Switch_Parody_DivX.avi

Originally posted by BakaXero
i dont really use macs but i;m on one right now and one of the programs has frozen.
What do i need to do to close it?