C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
C/C++ Language and Libraries Index
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  _O_APPEND              Open file for appending
  _O_BINARY              Open a file in binary mode
  _OCGA                  Value given by adapter element of _videoconfig
                            structure
  _O_CREAT               Create and open a file for writing
  _OEGA                  Value given by adapter element of _videoconfig
                            structure
  _O_EXCL                Return error if specified file exists
  _onexit                Handle function exit sequence
  _O_NOINHERIT           File not inherited by child
  _open                  Open a file
  operator               Redefine existing operators (C++)
  operator precedence    List of C/C++ operators and order of precedence
  optimize               Set optimization-level pragma
  _O_RAW                 Binary translation mode
  _O_RDONLY              Open a file for reading only
  _O_RDWR                Open a file for reading and writing
  _ORESCOLOR             Specify graphics video screen mode
  _ORES256COLOR          Specify graphics video screen mode
  _osmajor               "Major" version number global variable
  _osminor               "Minor" version number global variable
  _osmode                Variable specifying _DOS_MODE or _WIN_MODE
  _osversion             Version number global variable
  _O_TEXT                Open a file in text mode
  _O_TRUNC               Open and truncate a file
  _outgtext              Print font-based text in graphics mode
  _outmem                Print text of specified length in graphics mode
  _outp                  Output a byte at a port
  _outpw                 Output a word at a port
  _outtext               Print text in graphics mode
  _OVERFLOW              Result too large (math error)
  _OVGA                  Value given by adapter element of _videoconfig
                            structure
  _O_WRONLY              Open a file for writing only
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