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  1. SlotVInstall
  2.  
  3. Greg Robbins 9/91
  4.  
  5. This little program installs a slot VBL task for the 
  6. main screen, even if the main screen uses built-in
  7. video, by getting the gdRefNum and calling GetDctlEntry
  8. to find the slot number.
  9.  
  10. The VBL will run 5 times and then be dequeued.
  11.  
  12. Requires the MPW SIOW standard I/O package.
  13.