variables, functions, and
object properties are named with identifiers. ActionScript
identifiers must be composed according to the following rules:
Identifiers must include only letters (A-Z or
a-z), numbers, underscores, and dollar signs. Be
especially careful never to use spaces, periods, backslashes, or
other punctuation in identifiers.
Identifiers must start with a letter, underscore, or dollar sign (not
Identifiers may not be identical to reserved words.
Though not strictly required, it's also good practice to follow
the preceding rules when composing movie clip instance names, frame
labels, and layer names.
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