IPCMSG_GETWINBUF, // get a handle to the window's buffer
// - Window drawing commands
+ IPCMSG_DAMAGERECT, // (u16 win, u16 x, u16 y, u16 w, u16 h) - Force reblit of area
//IPCMSG_DRAWGROUP, // (u16 win, u16 group_id) - (hint) Switch to this group
//IPCMSG_CLEAR, // (u16 win) - (hint) Clear current drawing group
IPCMSG_PUSHDATA, // (u16 win, u16 x, u16 y, u16 w, u16 h, void data)