This inner class represents a local control channel.
One process can write replies using BasicServerControlChannel
interface, and the other can read replies using
BasicClientControlChannel interface.
waitFor(Flag aborted,
int ioDelay,
int maxWait)
Block until reply is waiting in the control channel,
or after timeout (maxWait), or when flag changes to true.
void
write(Reply reply)
write reply to the control channel
set reply count to 0. If this function is used consequently
at the beginning of each transfer,
then reply cound will always indicate number of messages
of last transfer.
Block until reply is waiting in the control channel,
or after timeout (maxWait), or when flag changes to true.
If maxWait == WAIT_FOREVER, do not timeout.