have return values

contain C expressions

contain certain C statements

have arguments

define macro local variables

use conditional statements

call other macros and predefined macros

be used in expressions, where they return values

reference target variables and registers

reference user-defined variables, in RealView Debugger or target memory

execute most RealView Debugger commands

be defined in a RealView Debugger include file.

be recursive

define global variables

define static variables

define other macros.