I know that the ascii character '0' evaluates to 48 or 0x30. Null and '\0' are guaranteed to evaluate to 0, so (with appropriate casts) they can be considered identical in value; 0.0.0.0 means that any ip either from a local system or from anywhere on the internet can access.
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The loopback adapter with ip address 127.0.0.1 from the perspective of the server process looks just like any other network adapter on the. %0 will never end, but it never creates more than one process because it instantly transfers control to the 2nd batch script (which happens to. It is everything else other than what is.