From: justliketomsthumbsblues@gmail.com   
      
   On Wednesday, May 31, 2023 at 3:17:30 PM UTC-4, Tom Thumb wrote:   
   > Mike Westerfield's "Toolbox Programming in C" contains a routine:    
   >    
   > void HandleControl (void)    
   > {    
   > if ((myEvent.wmTaskData4 & 0xFFFF8000) == 0)    
   > switch (myEvent.wmTaskData4) {    
   >    
   > ...    
   >    
   > I can find no explanation for doing this. I believe it's just testing if any   
   of the bits 17 - 31 have been set to one?    
   >    
   > I'd be grateful if someone would explain why this is being done. I imagine   
   I've missed something there or the IIgs Reference Manuals.   
      
   Oh, it's checking if wmTaskData4 is 32768.   
      
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