Inherited code I must change:
[paste]. What does it do, what
was the author worried about,
which parts are load-bearing,
and which look deliberate but
are accidental?

Explain This Code I Inherited

Load-bearing versus accidental, which is the risky part.

Prompt

I inherited this code and have to change it: [paste it]. Explain what it does, what the author was probably worried about, which parts are load-bearing, and which look deliberate but are probably accidental.