Why are the extensions enabled twice in SilkTest?
Configure the internal extension
This is the Agents Extension Enabler. It allows SilkTest to get into the process space of the application under test.
Configure the object extension
Loads the specified extension into memory so SilkTest can recognise the application specfic objects. This can be found in the SilkTest GUI under Options->Extensions.
The table below compares how and why the extensions are enabled in both SilkTest GUI and the Agent.