The Step Ladder handle is an invisible handle.  It is triggered by the
middle mouse button in the view port.  Usually, this handle is bound
using the "Bind to viewport handle" RMB option in the dialog.

The Step Ladder variant is designed to link to integer values, and
has the default increments of 1, 10, and 100.

Parameters:

    parm0-parm9  - The parameters which will be updated by the ladder.

See Also: Ladder
