Takes a string or list and puts them into the CALCnet buffer to be sent to the recipient in θ.
The recipient is stored in theta. If theta has a value of 0 a broadcast frame is sent instead.
A message can be a string (252 bytes or less) or a list (28 entries or less).
Packet is prepared to be sent out over the CALCnet network.
An integer is returned in Ans:
1: Packet was sent successfully.
0: The previous frame has not been processed yet.