Hi Ray,
GTP is a strictly asymmetric protocol, not intended to
be used directly between players. The specification draft
http://www.lysator.liu.se/~gunnar/gtp/gtp2-spec-draft2/gtp2-spec.html
expresses this clearly (1.3 Communication Model):
"The protocol is asymmetric and involves two parties, whi
"strictly asymmetric protocol, not intended to be used directly between
players" does not imply "All communication is initiated by the controller".
It would be reasonable to allow a player to ask the server "how much time
do I have left?", and "how much time does my opponent have left?". As
far as