Get_ServiceID obtains the number that is associated with
a Service. The Service can be a state table name or a service name
in the Service Definition file (see Service definition file.)
SendData
CallID (number)
Obtained using the Get_CallID custom server function.
Service (string[40])
The service name for which a ServiceID is required.
ReceiveData
ServiceID (number)
The number that is assigned to identify the service. If a Service
cannot be found a ServiceID of zero is returned.