`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.

     [3] ox_rpc(0,"fctr",x^100-y^100);
     0
     [4] ox_push_cmd(0,258);
     0
     [5] ox_select([0]);
     [0]
     [6] ox_get(0);
     [[1,1],[x^2+y^2,1],[x^4-y*x^3+y^2*x^2-y^3*x+y^4,1],...]

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

