Control When A Swf Is Loaded From Cache And When Is Not?

We have a web app. built in flash that allows customers to upload images and text, customize the container in which these will be shown (a swf file) and then embed the code into thier website. There is also a sharing options that allows their users to display this container, together with the content, on their websites. (For e.g you can see the container as the Youtube player and the content as the videos the user chooses to show). The swf container uses an XML file to know what to display.

Now, I am not a flash developer, but a person who takes care of the project.We are currently working on the app and the swf and we still find bugs. Every time we fix sth, I am told to erase my cache to see the changes. My concern is that the client/users might not see the newer version that we make available, but the old one. We can't tell them to erase the cache and we can't afford to renounce using the cache since the images are big.I was told that, sometimes, the browser does not see that the current version is a new one and loads it from the cache (actually, it never detected that there is a newer version and I always had to erase the cache). How can we tell the browser "now, load the swf from cache" or "now, don't load the swf from cache".