The /apps/metacity/global_keybindings/run_command_window_screenshot key defines a keybinding which causes the command specified by this setting to be invoked.
Mae'r allwedd /apps/metacity/global_keybindings/run_command_window_screenshot yn diffinio bysellrwymiad sy'n achosi i'r gorchymyn a benodir gan y gosodiad hwn i gael ei weithredi.