Version 4.0 of the OLE DB Provider for Microsoft Jet added support for several new schema rowsets that were not previously available. The most notable of these is the User Roster schema rowset. The user roster is exposed as a provider-specific schema rowset in the Jet 4 OLE DB provider. Since provider-specific schemas are not listed in ADO's type library for schema rowsets, you must use a GUID to reference the schema like this one.
The four things that can be returned for this schema are:
Below is an example Function of the User Roster code that checks which users are in a Microsoft Access database. You should be able to cut and paste everything from the "Begin Function" line to the "End Example" line into a new module and have it work for you.
Required Library Reference: Microsoft ActiveX Data Objects 2.1 Library (or later version)
An example of the VBA code is provided here: VBA Code for Getting the User Roster of a Microsoft Access Database
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