OT: general name for...

[David Bovill]

What is the the general name for "handler" for scripting languages - not
that anything is going to be perfect, but apparently "handler" refers to
"Handler, an asynchronous
callback<http://en.wikipedia.org/wiki/Callback_%28computer_science%29>subroutine
in computing", so what term could be used to refer to functions,
command, methods, and handlers across scripting languages - code chunks?