[ALUG] Over What Resources Is nice Nice?

I have a large ftp transaction in progress, with an ADSL-connected machine as the client, and my life would be more comfortable if other things (specifically X11 connections, with the same ADSL-connected machine as the X server) got priority over the ftp transaction for using the ADSL modem. I tried renice 20 [PID of the ftp client], which reported that it had changed the priority of the ftp client from 0 to 19, but this doesn't seem to have speeded up my X applications any, so I'm guessing that nice priority settings only apply to CPU, not to network bandwidth: is this right? If so, how can I make the ftp client be "nice" about network usage? -- Thanks Dan Hatton <http://www.bib.hatton.btinternet.co.uk/dan/>