It'd be easy to pipe markdown's output to
konqueror if konqueror would
take input from a pipe… oh, but it doesn't. So this road goes over a
temporary file with markdown's output.
Maybe there's some konqueror native way to get other input than from an
URL I don't know of.
I think that Konqueror supports the data: scheme. You could theoretically try to
use this to display arbitrary data (you would probably have to appropriately encode it
first, but you just pass a data: URI with no need of any sort of temp file).
--
Philippe Mavridis