to set/unset a bit.
Click 
to start the simulation.
Click 
to stop and reset the simulation.
Click 
to reset the simulation.
Enables/Disables 16 bits right shift.
Enables/Disables 8 bits left shift.
Enables/Disables 4 bits left shift.
Enables/Disables 2 bits left shift.
Enables/Disables 1 bit left shift.