on X Window System

xprop

shows properties on click

xwininfo

shows information on click

xwininfo -tree

shows tree down from clicked

xwininfo -tree -root

shows tree from root

xrdb -load .Xresources

loads your .Xresources

Section "InputClass"
        Identifier "Keyboard0"
        MatchIsKeyboard "on"
        Option "XkbLayout" "pl"
        Option "XkbModel" "thinkpad"
        Option "XkbOptions" "caps:ctrl_modifier,compose:menu"
EndSection