Mystery Dock window - what is it?

I've just noticed what appears to be the corner of a window in the upper left corner of my screen, and I can't figure out who it belongs to. Screenshot is here:
http://scamper.com/temp/mysteryDock.png
After trying everything to get rid of it, I finally noticed that it temporarily disappears when I issue a "killall Dock" in the Terminal, but as soon as the Dock reloads, the window corner is there again. I've closed all my Dashboard widgets (perhaps I should uninstall them too?), but I'm otherwise at a loss.
Clicking (left or right) on the window corner does nothing (in Dashboard a click will take me back to the Finder), and it can't be moved. How odd. Should I just tolerate it? It is out of the way, at least.
Dual 2.7 MHz PowerPC G5   Mac OS X (10.4.8)   mystery window in finder

I know what it is... is a little gray sign to show you that it is a HOT CORNER.
You may have that corner configured to show Exposé, Dashboard or a Screensaver when the mouse is over... if so, don't worry about 'cause it's very easy to remove...
Open Terminal (Applications/Utilities) and write this line:
defaults write com.apple.dock wvous-showcorners -bool false
You'll see that it probably didn't do anything, but there is yet another step.
Go to System Preferences and Dashboard & Exposé. There you'll see your hot corners (you should have the top-left one active). It doesn't matter what is there, just click the dropdown menu and select none
The little grey circle is gone. Those mysterious grey circles won't come back, so you can set anything as a hot corner again.
Hope it helps. Make me know if you need any extra help =)

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