By default if you run multistore website (that is have few stores) All of your customers once registered can login to all stores with the very same details.

But what if you don't want User A who registered at store A to be able to login to Store B? By default you have only one option, that is to run 2 completely separate websites (and make your life as admin harder because you have to administer and track 2 or more stores at the same time).

So here it is this module allows you to redirect users by their groups to a specified store you want.

All you have to do is assign different default customer group for each store. And assign where this group customers has to be redirected (to one or another store of your choice).

It is a must module for sellers who want to have more control over what is happening on their stores:)