Using __bytecode(“SomeByteCodeHere”); in your actionscript you can inject some bytecode into swf (It will be inserted at compile time).
It can be used to compactly represent some actionscript and hide the code behind in your FLA. But the swf produced is no different from that produced by normal actionscript unless you use some special optimization.
while (i < 10)
trace(“Holy shit, bytecode in the fla!“);
i = i + 1;