SuSE 9.0 with apt upgrades, Matrox G550 dual headed, one OR two monitors. If I tell YAST that I have only a single monitor, it writes XF86Config with only one Monitor section (monitor[0], modes[0]) and only one screen section, and only one device section. If I connect the second monitor, YAST refuses to recognize any capability for adding dual headed operations. It seems necessary to have XF86Config initially written for two monitors, or else manually insert all the second monitor/mode/screen section so YAST can reconfigure things. In the single headed configuration, I can grab an xterm and slide it from one virtual terminal to the adjacent virtual terminal, whether above/below or right/left. If I perform an install with two monitors connected, then it is not possible to slide an xterm from a virtual terminal to the adjacent virtual terminal to the right. Going up/down or to the left is OK. In any case, the xterm can slide part way into the adjacent rightward virtual terminal. After clicking into the right-side virtual terminal, one can grab the xterm and pull in all the way in (left-->right motion). Where is this functionality controlled? Approximately similar differences show up in Debian + KDM + Windomaker and in SuSE + KDM + FVWM.