The key will be how these "applications" are counted and how the restriction is enforced. If it uses operating system primitives such as processes and threads,

The key will be how these "applications" are counted and how the restriction is enforced. If it uses operating system primitives such as processes and threads, it's going to be messy. Imagine if you had IE, Word and Outlook open, tried to copy a file and received a "Sorry, that's too many applications!" message...