The geometry service works behind the scenes and is only visible to server administrators and developers. Those who make user connections to the server do not see the geometry service. However, they may be affected by the increased functionality that the geometry service provides in the server applications.
The geometry service is new at ArcGIS Server 9.3 and is not enabled by default. You must create it in order for your applications to use it.
To create the geometry service, choose the Add New Service option in either Manager or ArcCatalog. For service type, choose Geometry Service. When creating the geometry service, remember these important points:
If you are building a Web ADF application and you want to use the geometry service, it's recommended that you use SOAP. You can find information on the geometry service in the SOAP SDK, available at the ArcGIS Server Resource Center.