dynamically changing the login user id??

Hi all,

Is there any API to change the login user id dynamically.

Like for example, we have

WDClientUser.getLoggedInClientUser().getClientUserID(); in web dynpro and

request.getUser().getUniqueID() in UME for EP.

Do we have any api to set these values??

I need to switch between different users dynamically. So i need this.

If any one is aware of such API, please let me know.

Regards,

Narahari