MS Dynamics CRM Web Services 2011

MS Dynamics CRM 2011 provides two Web services. These services can be used to identify your organization and to access MS Dynamics CRM data.

IDiscoveryService Web Service - A single MS Dynamics CRM installation can host multiple organizations on multiple servers. The IDiscoveryService Web service returns a list of organizations that the specified user belongs to and the URL endpoint address for each organization.
http[s]://< hostname[:port]>/XRMServices/2011/Discovery.svc

To access the IDiscoveryService Web service, use Microsoft.Xrm.Sdk.dll assembly -> Microsoft.Xrm.Sdk.Discovery namespace.
Use the Execute method to execute a discovery service message.
RetrieveOrganizationRequest - Retrieves information about a single organization.
RetrieveOrganizationsRequest - Retrieves information about all organizations to which the user belongs.
RetrieveOrganizationsResponse

IOrganizationService Web Service - The Web service for accessing data and metadata in MS Dynamics CRM 2011
Organization Service Methods - Create, Retrieve, RetrieveMultiple, Update, Delete, Associate ( create a link between two records), Disassociate, Execute

IOrganizationService Entities

Best Practices for Developing with Microsoft Dynamics CRM