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─────PWB Extensions─────────────────────────────────────────────────────────
 
     Constant     Description
 
     TRUE         Nonzero (1)
     FALSE        Zero (0)
     NULL         Null pointer
     PNULL        Null handle for file (PFILE) or window (PWND)
     BUFLEN       Maximum size for a PWB line and other buffers
 
     Macro        Description
 
     EXTERNAL     Function modifier required for Whenloaded
                  (_loadds far)
 
     EXPORT       Function modifier required for extension functions
                  (_loadds far)
 
     Type         Description
 
     flagType     Boolean value
     PFILE        File handle
     PWND         Window handle
     linebuf      Buffer guaranteed large enough for any PWB line
     ARC          Rectangle
     ISA          Color index
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