Handlers

A handler is a collection of statements that AppleScript executes in response to a command or error message.

This chapter describes handlers in the following sections:

Script Applications describes script applications and how to create them. Sections throughout this chapter refer to script applications.
About Subroutines describes subroutines, which are handlers for user-defined commands, and provides a general overview of how they work.
Defining and Calling Subroutines provides a detailed description of how you work with subroutines, including examples that demonstrate labeled and positional parameters.
Command Handlers describes routines you write to handle application or system commands.
Scope of Script Variables and Properties describes the scope, or range, over which AppleScript recognizes a declared identifier within a script.

For information on writing error handlers, see Try Statements.