I'm running R 2.10.1 on a GNU/Linux Debian Squeeze (testing) I type : > help.start() I get : starting httpd help server ... Termin?. Si 'xdg-open' est d?j? lanc?, il ne sera pas relanc?, et vous devez passer ? sa fen?tre. Sinon, soyez patient... I think the translation is : If '/usr/bin/xdg-open' is already running, it is *not* restarted, and you must switch to its window. Otherwise, be patient ... Iceweasel starts and I get the page http://127.0.0.1:28025/doc/html/index.html Now I type : > ?plot It does not opens the help page in Iceweasel. It starts the R documentation in my terminal. To fix the problem : Create a .Rprofile file in your home/'user' directory containing the following command : options(help_type="html") I hope it will help. Tristan