The HDF_VG_INQTR function returns true if the specified tag and reference pair is linked to the specified VGroup in a Hierarchical Data Format file.
Result = HDF_VG_INQTR( VGroup, Tag, Ref )
The VGroup handle returned by a previous call to HDF_VG_ATTACH.
The tag number.
The reference number.
See HDF_SD_IDTOREF for an example using this function.