Skyfall begins with Bond in pursuit of a top-secret data program that might as well be called Red_Herring.exe. The list is merely a tool to get M out of hiding. But speaking of tool, we have to mention that Bond is able to use it as a weapon. The data chip—or whatever it is; what do we look like, Q?—is on a string, and Bond tries to strangle Patrice with it aboard the train.
The gist? It's used to cause harm in more ways than one.