Thanks, erm, Moron :)

In this case, though, the idea is that the log is tailed in a non-blocking way, so that rather than having to periodically check it - halting everything else - it's done either in multitasking environment (hence POE), or through something like threads (but sharing widget objects is painful).

The solution that I've found to sort of work is to have spawn a poe log tail wheel and a light poe http server that receives the tail in a buffer. The server than writes out the buffer in a page that periodically refreshes, and this page is served up in an iframe inside the xul app. The downside is that it's a bit jerky with the refreshing, but it gets the job done.