Generating Web Services from Application or
Entity Services
You can expose every CAF application or entity service as a Web service (WS).
Your service must have at least one operation.
...
1. Open the Composite Application Services perspective.
2. In the Service Explorer pane, use the secondary mouse button to select the node of the application service you want to expose and choose Edit.
3. On the General tab page, set the indicator on the Remote Enabled Service checkbox.

You can configure your WS to use the Single Sign-On mechanism.
The SSO allows users to authenticate themselves once, and then log on to all of those systems that operate in the SSO environment without further intervention.
For more information, see Using Single Sign-On for Web Services.
4. In the Service Explorer pane, use the secondary mouse button to select the node of the application service you want to expose and choose Web Service → New.
5. To use the default WS settings, choose Finish.

You can also change the settings of the generated WS.
The procedure is the same as for EJB Web services.
For more
information, see
Creating a Web Service
for an Enterprise JavaBean.