@chas,
I did a Google search for you and found this.
"If you're writing numbers instead of letters when you press the keyboard
of your laptop and you must hold down the Function key (Fn) to write
normally.
This is due to the fact that the digital lock is activated. To solve
this, simply press the Fn+Numlk or depending of the model, press the
button or Fn + Shift +Numl
"
Don't mind those other guys. They were just clowning.
GL