Is Single Sign-On supported for SAP Web Application Server? 
Is Single Sign-On supported for SAP Web Application Server?
Answer
Yes!
SSO
Yes,
Single Sign-On (SSO) or SSO2 is supported for SAP Web Application Server. This means you can use SSO in your BSP applications.A prerequisite for this is that SSO is configured for your SAP System. This configuration specifies, among other things, that SSP tickets are both generated and accepted. Make the configuration using the profile parameters:
The application’s own logon tickets are accepted without the need for any further settings.
Some Customizing settings do have to be made for external logon tickets. The settings are described in note 177895.
Note 177895 was originally written about the use of SSO in the Workplace, but it also applies to SAP Web Application Server.
For more information, see
Security with the SAP Web Application Server.Logon Ticket Cache
To increase performance with multiple logons, you can use the logon ticket cache. For more information, see
Logon Ticket Cache.