Able to pass the arugment as a username/password to the webdriver to open the browsers

Hi, Could anybody help on my requirement mentioned below.
We are using multiple intranet applications which is used in our customer env, in which each application should have SSO login with different userid.
E.g : App1 login with tech01 and App2 with tech02 similarly and need to give at the time of opening browser (Run as different user)
The issue here is we have common userid tech00 (Have administration access to the System) it required to login to the system and need to execute the Selenium script for App1.
Need your help on how to tell the Webdriver with this run as different users?
Is there any option to pass the arugment as a username/password to the webdriver to open the browsers?.

Note : we are exporting script with python+webdriver

Thanks,
Parthiban