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1C. identifiers and types
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identifiers are strings that the programmer uses to denote certain
objects, in most cases variables, or even keywords or function names
predefined by the compiler. An identifier may consist of:

- upper and lowercase characters
- "0" .. "9" (except as first character)
- "_" (the underscore)

All characters are significant, but the compiler just looks at the
first two to identify the type of identifier it is dealing with:

both uppercase:               - keyword like IF, PROC etc.
                              - constant, like MAX_LENGTH
                              - assembly mnemonic, like MOVE
first lowercase:              - identifier of variable/label/object etc.
first upper and second lower: - E system function like: WriteF()
                              - library call: OpenWindow()

Note that all identifiers obey this syntax, for example:
WBenchToFront() becomes WbenchToFront()