I have setup mojoportal such that  one client can have more than 1 site associated with it.

1 parent site - x child sites

However, each site has its own set of users. I have employee search page on parent site which can search employees (users) across parent site as well all its associated child sites. Each search result row has a link called "Login as Employee". When clicked, a new pop window is shown that goes to a custom page called - Impersonator.ashx?userId=x. This handler is responsible of validating the caller user (in this case, it has to be admin role type). Also, this handler knows what child site it is by evaluating userId and parentId against db stored procedure. I am able to succesfully display child site. However, I don't know what I need to do in order to automatically login this user (employee) into the child site with proper roles.

I can get username, password etc if I need to for that particular userId.

Thanks,

-bobsov