Laurent is right; the configuration setting that he has identified causes a server to set the default for operations to either the overlay layer or to the origin layer.
The majority of clients that access the server do not specify an overlay group, so they will use the default specified in the config setting. There are exceptions -- AR installers specify that their operations occur in the origin layer and they will do that regardless of the configuration setting. Dev Studio and Migrator have specific knowledge about overlays and origin objects so they also specify overlay groups in their API calls, and other API programs could do the same. The idea is that we can cause a server to either run the customized version of an application or the original version, generally so that we can compare behaviors. Outside of that use case or just for experimentation, there probably aren't many times where folks will want to set the default. -Chuck _______________________________________________________________________________ UNSUBSCRIBE or access ARSlist Archives at www.arslist.org "Where the Answers Are, and have been for 20 years"
