It opens drop down menu for the file manipulation. The menu consists of
Move - alter the position of entities
Stretch - alter the size of entities
Split - create additional vertices in entities
Mirror -
Transfer - move entities to another layer
Rotate - rotate entities to an angle around a point
Delete
Change
Zoom window - draw a rectangle to designate the area to be displayed
Zoom in
Zoom out
Zoom Pan - Pan the Drawing
Zoom fit - show the drawing at a size that will include all entities
Mid Point - Snap the Media Point of a segment
Point - Snap On a Point
Center - Snap On the Center of arc circle
End Point - Snap The end point of a segment
Intersection Point -Snap on the intersection point
Origin Point - Snap on the Drawing origin point 0,0
Perpendicular - Snap on perpendicular
Tangent - Snap on Tangent
Linear
Horizontal
Vertical
Radial
Angular
Focus
Undo stack
Redo stack
Image undo
Image redo
GC