expressive marks inside slurs

[Paul Scott]

2.13.46:

I've been searching the documentation and the web for a while trying to 
get accents, etc. inside slurs.

1.  What draws accents, turns, etc.?

2.  What does the word 'script' in the internals reference mean?

\override Slur #'outside-staff-priority = #1
as found in someone's post doesn't seem to work unless I don't know 
where in the code to place it.

Thanks for any help,

Paul Scott