Hi Al.

>I can't see where the iDemoEvents interface is defined.

VFP adds an "I" prefix to the name of the DemoEvents class to create the IDemoEvents interface.

>And, in the sample IDEMO.PRG, the cCallBack class is instantiated before the iDemo COM server.

The iDemo COM object doesn't have to be instantiated in order for the cCallBack class to implement its interface.

Doug