Restores default viewing parameters.
Moves your view in the direction of the arrow.
Add line to currently selected lines in the current layer.
Add layer to currently selected layer(s).
Zoom Overlay Toggle over location of arrow when no Sticky Zoom is not enabled and data selected. (Spacebar Zoom)
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Increase/decrease overlay scale.
Deselects any previous selected lines(s).
Deletes currently selected line(s).
Displays the previously selected guide.
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Rotate image right or left.
Send currently selected CAD layer to the Surface/Layer selected.
Toggle Plus Marks on/off.
+ 
Displays the CAD layers selection window.
+ 
Hide currently selected line(s)
+ 
Undo last edit(s) - up to ten stored.
+ 
Redo previously undone edits.