importance of my left-hand pointer finger

This is the most important finger for my left-hand/side. My left-hand; in my stroke case does not have any to little motor skills.
Therefore; my left-hand pointer finger has the most of all of the fingers motor skills.

Keyboard:
I use the pointer finger; guided by right-hand to go to one key only. The finger does have the ability ; if placed correctly; to hold down keys and apply the needed pressure for the keyboard key to work.

Car: windows-channel changing-volume:
I use the pointer finger of my left-hand to apply pressure on the the key needed to apply the information needed; i.e. changing the channel to volume to opening up a car door window for air.