I am investigating the Program pin that exists on many of the Teensys as a solution to reprogram the Teensy when automatic programming doesn't go through (why does this happen?) and the button is inaccessible.

I imagine it works something like the reset pin, but causing the Teensy to reprogram rather than restart. (I am working with Teensy 3.6/LC/3.2)

After researching for a while to find out, I couldn't find what I was looking for, so I may be misinterpreting it's purpose, or just searching the wrong things.

If anybody could explain or link me to this information, would be much appreciated.