Hi Sam, thank you for your answer. I have compiz 0.8.4 and there is a "Lazy Positioning" option in the "Move Window" plugin settings page. It was on by default and turning it off solved the problem! Now a window follows continuosly the changes of the other. Wunderbar. One thing more, however, which seems strange to me. In case of a resize the movement of the "linked " window is perfectly smooth. But in case of a move the movement is jerky, the window shivers and there is a noticeable spring effect i.e. there is a visible delay in the movement response. It seems strange to me because there aren't two different code paths for the two cases, the code is perfectly the same. I get a ConfigureNotify event, and on the basis of the new window position/geometry move the other, regardless of the type of the generating event (move or resize). May be that in the two cases compiz generates configure notifications differently? A huge thanks, Luca <div class="gmail_quote"> 2013/6/19 Sam Spilsbury <<a href="mailto:smspillaz@gmail.com" target="_blank">smspillaz@gmail.com</a>> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Hi Luca, In recent versions of compiz (0.9.10) if you have lazy positioning on (org.compiz.move 'lazy-positioning') other clients won't get a configure notification until the end of the move. This is a performance optimization to avoid a slow path on the nvidia drivers with vsync. If you want such notifications you need to turn this option off. Either that or implement this as a compiz plugin so that you can get move notifications in real time. Sam. <div class="gmail_quote"><div><div class="h5">On 19/06/2013 1:57 PM, "Luca Rocca" <<a href="mailto:disquisitiones@gmail.com" target="_blank">disquisitiones@gmail.com</a>> wrote: </div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"> Hi, I'm Luca from Savona, Italy. I'm using Compiz and I'm writing an application with Xlib to draw two windows, let's say window_A and window_B. I would like to keep fixed the relative position between two established corners of them that they have when mapped. So that if I move or resize one of the window, the other if necessary automatically moves to observe the condition. I'm close with this code, let's see for example the case for window A: <blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">XSelectInput ( display, RootWindow ( display, 0 ), SubstructureNotifyMask ); XEvent event; while ( true ) { XNextEvent ( display, & event ); /* ... */ if ( event.type == ConfigureNotify and event.xconfigure.window == window_B ) { // new_x, new_y based on event.xconfigure.x, event.xconfigure.y, etc... XMoveWindow ( display, window_A, new_x, new_y ); } /* ... */ } </blockquote> The problem is that the move correction of a window is only applied at the end of the move/resize operation of the other and not continuously during it. Is there a way to obtain this as if the two windows could behave like one rigid body? Thank you in advance, Luca </div></div>_______________________________________________ compiz mailing list <a href="mailto:compiz@lists.freedesktop.org" target="_blank">compiz@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/compiz" target="_blank">http://lists.freedesktop.org/mailman/listinfo/compiz</a> </blockquote></div> </blockquote></div>