What does the Q_OBJECT macro do? Why do all Qt objects need this macro?

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From the Qt documentation:

The Meta-Object Compiler, moc, is the
program that handles Qt’s C++
extensions.

The moc tool reads a C++ header file.
If it finds one or more class
declarations that contain the Q_OBJECT
macro, it produces a C++ source file
containing the meta-object code for
those classes. Among other things,
meta-object code is required for the
signals and slots mechanism, the
run-time type information, and the
dynamic property system.

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