Caps lock on-screen indicator?

[Rich Shepard]

I just purchased a Lenovo ThinkPad T430 to replace my old Dell Latitude.
There's no embedded numeric keys on the keyboard and the laptop has no
indicator for caps lock (there's no scroll lock key or indicator, either).

Apparently M$ puts a visual caps lock indicator in the bottom-right corner
of the screen, but Slackware doesn't do this.

Is there an xfce applet that I can install to tell me when I've accidently
turned on caps lock?

TIA,

Rich