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     A handler for Int 05h can distinguish between BOUND errors and
     print screen requests with the following steps:
 
       1. Read the return address from the stack.
       2. Examine the two bytes immediately preceding the instruction
          at the return address.
       3. If the two bytes equal CDh 05h (Int 05h instruction), the
          call is a request for PRINT SCREEN. In this case, the handler
          should pass control to the BIOS routine to service the
          interrupt.
                                    -♦-