see if any processing 
  was needed. This would happen whether or not processing was necessary. Interrupts 
  can be assigned priorities such that a disk drive might take priority over a 
  printer. It is up to the programmer to optimise all this for efficient processing. 
  In the IBM compatible PC, low number interrupts have a higher priority than 
  the higher numbers.</p>
<h3>Calling an Interrupt</h3>
<p>This is quite complex. The command INT 02 whether triggered by hardware or 
  software, caus