MovieClipLoader.unloadClip() - Documentation Lies?

The Help file for Flash 8 says regarding MovieClipLoader.unloadClip()

so i assumed that i could use unloadClip to cancel a download…

neither of these things seem to be true - anything in the function associated with the MovieClipLoader.onLoadProgress event continues to execute despite the unloadClip being called

is there a way to halt the MovieClipLoader from loading?

if not, why does the help file make it seem that way?