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what does SSO authentication touch point used for ?

Question asked by zengqingyi12 on Oct 23, 2010
Latest reply on Dec 3, 2010 by kevinr
I find there are following code in NTLMAuthenticationFilter.java which used for alfresco share SSO authenticate:

               Response remoteRes;
               if (cachedNtlm)
               {
                   Connector conn = connectorService.getConnector(this.endpoint, session);
                   ConnectorContext ctx = new ConnectorContext(null, getConnectionHeaders(conn));
                   remoteRes = conn.call("/touch", ctx, req, null);
               }
               else
               {
                   Connector conn = connectorService.getConnector(this.endpoint, AuthenticationUtil.getUserId(req),
                           session);
                   ConnectorContext ctx = new ConnectorContext();
                   remoteRes = conn.call("/touch", ctx);
               }
and I found the alfresco/service/touch 's description is:
SSO Authentication touch point, so what is touch point used for ?  And how it works with SSO ?  
Can someone point me the direction or the references ?
Thanks !

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