How do i load a movie that loads another movie within it?

1

i have a main movie (let’s call it main.swf) that has a container MC (called contentsMC) within it. contentsMC loads other movies (for example, ABC.swf) inside it. how do i create a link/button from another movie (123.swf) that when clicked, loads main.swf and also ABC.swf inside contentsMC?