Turns on or off IK handles.
Tgl – The IK handles’ states will be toggled. That is, if an IK handle is ON then it will become OFF, or if OFF will become ON.
Tgl Unify – If the selected IK handles are either all on or all off, then this behaves the same as Tgl.
If some of the selected handles are on and others off, then the first use of this control will set them all to the same state—subsequent use of this control will then behave the same as Tgl.
On – Forces all IK handles to be ON.
Off – Forces all IK handles to be OFF.