large messages

[LANDAU_CHARLES@Tandem.COM]

  >How is larger-than-4K message transfer generally done in KeyKOS
  >between a client and a server that doesn't want to trust the client's
  >promptness?

A shared server domain wouldn't do a ping-pong transfer directly. It
would create a domain to do this, using the factory mechanism or
equivalent. It creates the domain using client-supplied resources. That
is why it is necessary to pass a meter and one or two space banks on the
very first call.

  >Has this been a problem in practice?

The need to do ping-pong was rare. There were a few cases where many
keys had to be passed. I can't recall any practical case where >4K of
data were passed this way. As you know, a segment key could be passed
instead.

By the way, the return code returned by a data key (which is KT+1, not
KT+2, Bill) is not reserved; a real key can also return that value.