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The API (Application Programming Interface) of VPE defines two important datatypes:

VpeHandle, which is used as a handle to documents and other types of internal objects. On 32-bit platforms, this is a 32-bit integer and on 64-bit platforms this is a 64-bit integer.
(In fact it is typedef'd as a void pointer "void *").

VpeCoord, which is used to specify coordinates as parameters to functions. VpeCoord is of type double.