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The UNVIEW function is used to close a window previously opened with the VIEW function. By default, the last window that has been opened will be closed. To close a specific window, use the /only refinement and specify the window's face (that which was returned from a layout, for example). All windows can be closed with the /all refinement.
The example below opens a window that displays a Close button. Clicking on the button will evaluate the UNVIEW function and the window will be closed.
view layout [button "Close" [unview]]
Note that the VIEW function will not return until all windows have been closed. (Use VIEW/new to return immediately after the window is opened.)
The next example will open two windows, then use UNVIEW/only to close each one separately.
out1: layout [button "Close 2" [unview out2]] out2: layout [button "Close 1" [unview out1]] view/new out1 view/new out2 do-events
You could have closed both windows with the line:
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