docker(1) on Linux
The text a4655bfbb50b, as Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny) shipped it.
System tray for KDE3/GNOME2 docklet applications
Flags it lists
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-border -
-color -
-display -
-h-help -
-iconsize -
-vertical -
-wmaker