Datagram

The pseudo header conceptually prefixed to the UDP header contains the source address, the destination address, the protocol, and the UDP length. This information gives protection against misrouted datagrams.

The Modifiable Data Base is a very nice system and is, generally, highly recommended* It is memory dependent and, once formated,^([sic]) (datagrammed) is not changeable.

>* How does the dispatch station know where the trains are? Is it >just by the engineer notifying them, or is it done by some computerized >system in the track? Varies. Most common is by track circuits, in which the train indicates occupancy of a "block" by shorting the rails together. This gets "datagrammed" to the CTC center. (short hand, simplified description).

the crowd mills about datagrammed packets flowing without words to say.