gtos_become_master [force | noforce]
This command requests that the sender be made the Active GUI client.
A mode of force indicates that the client wants to become
the Active client even if another client is currently
the active client. A mode of noforce indicates that it
only wants to be Active if there currently is no other Active
client.
DCSS responds with stog_become_master if the GUI succeeds in becoming
the Active client. If noforce was specified by the GUI client
and another GUI is currently Active, DCSS will reply
with stog_other_master.