Hey, I got the solution to my annoying problem: why it works anyway? The plumber to plumb DSCN1549.jpg to page is not the plumber to be run from $OCTOPUS/dis/o/termrc, but the plumber done by wm/sh of inferno of the same file . That's the reason why I have to change $OCTOPUS/usr/octopus/port/lib/view.b.
Now I deleted the lines of plumber ftest -e /dis/o/idle.dis && o/idle from the termrc in $OCTOPUS/dis/o. Yeash, I'm happy now, and going to next step Kenji