• b
display the list of binding keys
• d
(de)select or delete objects
• f
zoom the display to fit the core area
• k
create a ruler
• K
remove last ruler displayed
• q
display the object attribute editor form for the selected object; click the left-button mouse
to select an object, shift-click to select or deselect an object
• u
undo last command
• U
redo last command
• z
zoom-in 2x
• Z
zoom-out 2x
• Arrows pan the display.
Hit CTRL-R to refresh the display.