Before ADO 2.0, you were limited in what you could do using the default DataFactory object provided by Remote Data Service. The DataFactory could connect to a data source and execute a query command, or update the data source with a Recordset object.
With this release, an extension, or handler, can override the default DataFactory connection or command with parameters supplied in a customization file. In addition, the ability of an administrator or guest to read or write data is governed by access rights. You can also design your own custom business objects to use a handler.