Returns the major version number of the host operating system.
PRL_RESULT PrlSrvCfg_GetHostOsMajor( PRL_HANDLE hSrvConfig, PRL_UINT32_PTR pnHostOsMajor );
PrlApiDisp.h
PRL_RESULT. Possible values:
PRL_ERR_INVALID_ARG - invalid handle or null pointer was passed.
PRL_ERR_SUCCESS - function completed successfully.