LONG type
#if AR_USE_64_BIT 
  typedef INT64 LONG;
  typedef INT32 LONG;

The LONG type is an architecture dependent type used for variables that can hold the widest signed integers. It can be either 32-bit long or 64-bit long, when 64-bit integers are used, by setting AR_USE_64_BIT to 1.

Header file:AR_Types.h (include AR_API.h)
See also: AR_USE_64_BIT, INT8, INT16, INT32, INT64, UINT8, UINT16, UINT32, UINT64, ULONG
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