Hi Louis,
With Multi-Site the one key to remember is that _only_ the INIT method in the WebServer procedure, in the DLL, is ever run. Any other embed code in the WebServer procedure is ignored (because it is the WebServer procedure in the Host which is running.)
Therefore the best place to set the owner string in the Web app, is in the WebHandler, ProcessLink method, before the parent call. And make sure the Owner string itself is THREADed.
cheers
Bruce