Web services

Hello  sir,

I have need to implement the single sigon implmenation for exteranl system using webservices(soap) available in Moodle 2.1.

I have went through the moodle 2.1 documentation. but did not get how to do using web service client.

link that i was refer...

http://docs.moodle.org/20/en/How_to_enable_web_services_for_an_external_system

http://docs.moodle.org/dev/Creating_a_web_service_and_a_web_service_function#Add_the_web_service_function_into_a_service

Thanks
padmane