What is SSO authentication touch point used for?

I find there are following code in NTLMAuthenticationFilter.java which used for alfresco share SSO authenticate:

   Response rem开发者_C百科oteRes;
   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/wcs/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!

can you clearly, explain your problem...

what your are trying to achieve.... SSO ?

Please look into this pdf

http://www.ultra-scan.com/Portals/16/TouchPoint%20Healthcare%201-27-06.pdf

Regards, Krishna