Can virtual back links be created?

Is it possible to create a virtual attribute on one class of objects and tie it to another attribute via a backlink?

I'm wanting to do something similar to how members and memberof attributes work. You populate members and the memberof attribute is back-linked to it.

I haven't found any references to doing this on any document. I've looked at all the documentation available, the SDK, and have searched the forums without any luck. Only one reference in the search someone stated they did this but didn't specify how.

Any help is really appreciated.