I've never used a keyboard/driver which had this functionality (CAPS Lock only affects letters on any system I've used in the past). However, I believe the SHIF

I've never used a keyboard/driver which had this functionality (CAPS Lock only affects letters on any system I've used in the past). However, I believe the SHIFT LOCK key that existed on some typewriters functioned in the fashion described in the article, as the SHIFT LOCK key did, in fact, affect all keys on a few typewriters I have used.