reHi, This solution is used by the bttv module to do overmay access (video-acquisition-card -> video-display-card) And it works great even if stall Xfree !!!! the video continues !!!! look at the drivers sources. Chris. -- don't forget to remove NOSPAM_ for reply Kumsta Christophe <christophe.kumsta@free.fr> Real-Time image processing developper RT-Linux/RTAI ( Use the Source Luck !)