Activate Single Sign On (SSO) in the SAP Service Marketplace

This is really a larger benefit for you and just takes only seconds. Then you never have to enter your S-User-ID and the password again, even if the SAP-Servers change there names and so on!
Use the following link to just activate SSO in your browser, using a X.509 certificate:
Activate SSO
If you are interested in more infomation about this, you can have a look at the following link as well:
More SSO Infos
(As the certificates are installed in your browser, you have to do this at every PC you are working.)