For example, The bytecodes are stored in SWF in binary form.
They are interpreted by the virtual machine of the Flash Player.
Often there's no difference between the string , those commands are similar to stack manipulations.
The stack is like an array of values, except you can only access the value on top, push another value onto the top, or swap the top two values.
The explanation is for Windows 2000, but it should work with minor changes for any Windows version. Note Win Flasm is old and does not support all Flasm commands.