__HRBRUN(  <cFile> [, xParam1 [, xParamN ] ]  ) -> xReturn
  Execute specified hrb file, passing optional paramaters.
 
__HRBLOAD( <cFile> ) -> nHandle
  Load an hrb file and return a Handle.

__HRBDO( <nHandle> )
  Execute previously loaded hrb module specified by it's Handle.

__HRBUNLOAD( <nHandle> )
  Unload an hrb module.

__HRBGETFU( <nHandle>, <cFuncName> ) -> nHandle
  Retrieve Handle to specified function in a given preloaded hrb module.

__HRBDOFU( <nHandle>, [xParam1 [, xParamN] ] ) -> xReturn
  Execute specified function by its handle, passing optional paramaters.
  