Using [Embed]

Hi guys,

Can I use [Embed] in my AS3 that I compile with Flash CS3 ?

Is there a difference between using AS3 one way (say, with Flash CS3) and another way (say, with Flex) ? I don’t get it.

What I do is use a stand-alone text editor (Visual Studio 2005) to write my code, then I use Flash CS3 to compile it. Am I missing out on anything ?

Thanks.