rem: PortLink link(server); link.SetOpCode(AS_SET_CURSOR_SYSTEM);
add: BPortLink link(server); link.StartMessage(AS_SET_CURSOR_SYSTEM);
context: void setcursor(cursor_which which){	port_id server=find_port(SERVER_PORT_NAME);	if(server!=B_NAME_NOT_FOUND)	{		PortLink link(server);		link.SetOpCode(AS_SET_CURSOR_SYSTEM);		link.Flush();	}}