Why can't I press more than 2 ons at a time on my PC?

ANY PROCESSOR CAN RECEIVE SINGLE DATA AT A TIME SO WHEN U PRESS TWO ONS IT ADOPTED TO SENDING ANY ONE OF THEM DEPENDING ON CHARECTER PRIORITY. WHEN U PRESSED THIRD ON IT GIVES A WAKE UP SIGNAL THAT A CHAR IS ALRADY IN PROCESSING(A BEEP SOUND).