The concern is if the applet after the first download get cached locally and even if we turn off the computer and then when we came back to the url from where the applet was downloaded... does it get downloaded again or it is loaded locally from the machine because it has been dowloaded already? Does it get downloaded again??Does it get a cached copy???
Web browsers cache pretty much everything: applets, images, video clips. It's a common mistake when debugging an applet not to clear the cache and wonder why nothing has changed. It's also fun to look into a co-worker or friend's cache and see what they've been up to.