Yes. It was rarely used, for fear of changing the past.

[Fears that, in the end, had proven to be correct. He nods again at the second question.]

Terminators' CPUs can learn from the people around them, but they are set to read-only when we are sent into the field. Mine was reset.

[Even now, his systems are taking in the data he's receiving from this conversation. It pours over it, adding to his memory banks, and compiling it to reach conclusions he had been unaware of before.]