This command starts an incremental search in the window specified by num, the window id number. If an incremental search is already active in that window, then the current search string is searched again. Putting a plus sign (+) in the command searches forward. This is the default. Putting a minus sign (-) in the command searches backward.
This command should not be used from the command window. It should be bound to a key with the keybind command, or to a mouse press with the mouse command. See keybind and mouse.