DIIOP (Domino Internet Inter-ORB Protocol) is a server task that works with the Domino Object Request Broker. When set to 1, this variable launches the DIIOP server task when Preview In a Browser is selected from Domino Designer.
Note: You set this variable to 1 by selecting "Launch the CORBA (DIIOP) server on Preview in a web browser" option in the Additional Options section of the Basics panel of the User Preferences dialog box, and deselecting "Launch the CORBA (DIIOP) server on Preview in a web browser" causes this variable to be removed from the NOTES.INI file.