`ox_push_cmd', `ox_sync'
------------------------

ox_push_cmd(NUMBER,COMMAND)
     :: Sends a command COMMAND to a process whose identifier is NUMBER.

ox_sync(NUMBER)
     :: Sends OX_SYNC_BALL to a process whose identifier is NUMBER.

RETURN
     0

NUMBER
     integer(process identifier)

COMMAND
     integer(command identifier)

   * Sends a command or OX_SYNC_BALL to a process whose identifier is
     NUMBER.

   * Data in OpenXM are categorized into three types: OX_DATA,
     OX_COMMAND, OX_SYNC_BALL.  Usually OX_COMMAND and OX_SYNC_BALL are
     sent implicitly with high level operations, but these functions
     are prepared to send these data explicitly.

   * OX_SYNC_BALL is used on the reseting operation by `ox_reset'.
     Usually OX_SYNC_BALL will be ignored by the peer.

References
     *Note `ox_rpc ox_cmo_rpc ox_execute_string': ox_rpc ox_cmo_rpc
     ox_execute_string, *Note `ox_reset ox_intr register_handler':
     ox_reset ox_intr register_handler

