#define FALSE 0

RWBoolean value (defs.h) (or false if bool type is supported). The use of RWBoolean is deprecated, but this definition is kept for backward compatibility.

#define TRUE 1 

RWBoolean value (defs.h) (or true if bool type is supported). The use of RWBoolean is deprecated, but this definition is kept for backward compatibility.

#define rwnil 0

nil pointer (defs.h)

#define RWTOOLS 0x070500

The actual current version number (tooldefs.h)

const RWoffset RWNIL = -1L;

"no offset" in an RWFile (defs.h)

const size_t RW_NPOS  = ~(size_t)0;

"not found" as index into array (defs.h)