Hi, wmctrl could fail, if I want to get the PID that belongs to a window? assumed I want to kill just one instance of xfw, how could I e.g. get the PID of the xfw windows? [rocketmouse@archlinux ~]$ ps aux|grep -v grep|grep xfw rocketm+ 28733 0.2 0.3 126964 13836 pts/4 S+ 14:25 0:00 xfw root 28734 0.0 0.1 72312 5216 pts/3 S+ 14:26 0:00 sudo xfw root 28735 0.2 0.3 127744 14220 pts/3 S+ 14:26 0:00 xfw [rocketmouse@archlinux ~]$ ps aux|grep -v grep|grep pluma rocketm+ 28736 4.0 1.0 625936 40996 pts/2 Sl+ 14:26 0:03 pluma root 28741 0.0 0.1 72312 5112 pts/1 S+ 14:26 0:00 sudo pluma root 28742 3.1 0.8 991168 32152 pts/1 Sl+ 14:26 0:01 pluma [rocketmouse@archlinux ~]$ wmctrl -lp 0x00a00003 -1 25836 archlinux panel 0x00e0001d -1 25835 archlinux panel 0x00800007 0 28670 archlinux rocketmouse@archlinux:~ 0x014004be 0 0 N/A .jackdrc - /home/rocketmouse 0x018004bf 0 0 N/A .bashrc - /root 0x01a00114 0 28736 archlinux .jackdrc (~) - Pluma 0x01c00110 0 28742 archlinux .bashrc (~) - Pluma [rocketmouse@archlinux ~]$ Regards, Ralf