Yes, that's what I meant: Thinkpads, typically, have a little red knob in the keyboard center, which is a tactile device, that lets the user control the mouse c

Yes, that's what I meant: Thinkpads, typically, have a little red knob in the keyboard center, which is a tactile device, that lets the user control the mouse cursor very precisely. The patent has expired and this is why some third party vendors started producing them.