DFUHLP.HLB  —  DFU  Screen Management, Special Keys
 In SMG mode the following keys perform special functions (Keys between
 () are keys on a PC keyboard) :

 o CTRL/W                : Redraws the screen
 o HELP or PF2 (/)       : Invokes the help facility
 o PF4         (-)       : Dumps the screen contents to file DFU_SCREEN.TXT
 o PREV_SCREEN (PageUp)  : Scrolls the output window back (one screen)
 o NEXT_SCREEN (PageDown): Scrolls the output window forward (one screen)
 o INSERTHERE  (Insert)  : Scrolls the output window back (one line)
 o REMOVE      (Delete)  : Scrolls the output window forward (one line)
 o SELECT      (End)     : Toggle between 80/132 columns
 o UP/DOWN               : Recall command buffer
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