External SWF with movieclips in it

Good Day Everyone,

I am newbie in the forum and I have a question thats been on my mind for a couple of weeks.

I have swf files and inside those swf files have components like movieclips(with instance names)and dynamic text fields(also with instance names).

Now, I have a separate flash program and I want to load those swf files and change the alpha properties of the movieclips inside it and input some text in the dynamic text field. I know how to load an external swf file but I do not know how to change the properties of its components.

Anybody help, pleaseā€¦