MConnect

Do not create instances of TCOMConnection. Instead, use TCOMConnection as a base class when created a custom component that forms a COM-based connection to an application server. 

TCOMConnection adds to the ability to work with COM objects to the generic connection capabilities inherited from TDispatchConnection. It has two descendants: TDCOMConnection, which creates and manages connections using DCOM, and TOLEnterpriseConnection, which is provided for backward compatibility and handles connections using OLEnterprise. 

TClientDataSet 

TDCOMConnection 

TOLEnterpriseConnection 

TDataSetProvider 

IAppServer 

Writing Applications Using COM