note
To remove a projector from the group, select it from the projector list and click Delete.
5.Click Add. The IP address appears in the list of registered printers, and the 
searching icon appears beside it. If the projector is found, its name appears in the projector list.
6.Repeat steps 4 and 5 for each projector you want to add to the group.
7.Click OK to save the projectors as a group. When you see a confirmation message, click Yes.
8.Click Close to close the Advanced screen.
9.Click OK to close the Extension screen, then close NS Connection.
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