Auto-fill in registers: how does it work?

[Charles Day]

When manually entering new transactions in the register, how does the
auto-fill capability work? Does it (a) just look at existing transactions,
make a guess at a match, then copy the information? Or does it (b) draw that
information from a bucket of "memorized transactions"?

Quicken does the latter and, and some versions allow that separate bucket of
"memorized transactions" (transaction templates, essentially) to be exported
to QIF format.

I ask due to an enhancement request for importing these via the QIF
importer.

Cheers,
Charles