MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix C: OLE DB Properties
Property group: Data Source Information
Property set: DBPROPSET_DATASOURCEINFO
Type: VT_I4
Typical R/W: R
Description: Heterogeneous Table Support
A bitmask specifying whether the provider can join tables from different catalogs or providers. A combination of zero or more of the following: