HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

                TC: int _open( const char *path, int access )

       - prototype in io.h, also include fcntl.h

       - this function will not create a file, use _creat() if it doesn't
         currently exist
       - access is a combination of the following:

               DOS 2.0+ Attributes
               O_RDONLY        open read only
               O_WRONLY        open write only
               O_RDWR  open read/write

               DOS 3.1+ Attributes
               O_NOINHERIT     file is not to be passed to child processes
               O_DENYALL       file is not accessible to others (exclusive)
               O_DENYWRITE     file is read only to all other opens
               O_DENYREAD      file is write only to all other opens
               O_DENYNONE      file is to be shared by all

       - MS C uses _dos_open()
       - see   INT 21,3D   open()   _creat()

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