Zoom Window lets you draw a selection rectangle or "window" to view part of your display in the drawing window.
The prompt reads "zoom window:". Select one corner of the view you want with the crosshairs or by typing in numeric coordinates.
CC3 changes the cursor to a stretching rectangle.
The prompt reads "Opposite corner:". Select the opposite corner of the zoom window, using the stretching rectangular cursor as a visual guide.
CC3 redraws your screen to show the part of your drawing that fits within the rectangle you drew.
Text equivalent: ZWIN