This is probably an artifact of your keyboard. Most keyboards have sets of keys that can't be read in combination. For example, on the classic Model M, QWAS a

This is probably an artifact of your keyboard. Most keyboards have sets of keys that can't be read in combination. For example, on the classic Model M, QWAS all pressed at once won't work properly (but asdf does.) Find out more at http://en.wikipedia.org/wiki/Rollover_%28key%29#n-key_rollover http://en.wikipedia.org/wiki/Rollover_%28key%29#n-key_rollov...