Hi again, thank you all for your hints.
root-tail works out of the box, but for flexibility and better formattingof the output, I'll give the label-in-FvwmButton-approach a shot. Looks pretty easy going.
Cheers, Martin -- fvwm3 1.0.0 (1.0.0-10-g424a650e)with support for: ReadLine, RPlay, XPM, PNG, SVG, Shape, XShm, SM, XRandR, XRender, XCursor, XFT, NLS
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