<b>Undo/Redo</b>
[[B2RF.Spice A/D]] has unlimited levels of undo and redo. To undo any changes to the schematic, use the keyboard shortcut Ctrl+Z keys. The redo any undone changes, use the keyboard shortcut Ctrl+Y.
[[File:b2MAN_Fig36.png|thumb|400px| Node numbers in a schematic.]]