KermMartian wrote:
2) No - the receiver SID is the first thing sent; all calcs check it and don't bother listening to the rest of the packet if it's not for them.
You could do something like ethernet and have a broadcast SID that everyone on the network listens to (like if receiver SID == 00000000, then everyone checks the message) But as for what elf was saying, just send a ping request to the desired SID and see if you get a response - that'll still work just fine