When would I replay a .log file?

[Doug Laidlaw]

I am familiar with restoring an earlier .xac file.  Thankfully, I haven't had 
to do it for a while.

I see that replaying a .log file is an option on the File menu.  When would I 
want to do this?

It is risky asking two questions in one post, but when I am entering data in 
two-line ledger mode, is there a keystroke to enter the same amount in both 
lines?  I thought that I saw a reference to one in a post some time ago.  It 
would be particularly useful when editing the amount in a Scheduled 
Transaction already entered.  Like the gent who wanted a system bell, I have 
typing difficulties (he wasn't old: I am 65.)

(BTW, I really like the symbol for a Gnu used as a favicon on the Wiki.)

Doug.