Explains how to increase the maximum number of open files (FD) under Linux operating systems by editing /etc/sysctl.conf and /etc/security/limits.conf file.
Hmm. I should mention that I dual boot with Windows sometimes, and in fact it's currently completely broken in there - Fn+F5 doesn't even show it (it shows the other two functions) and my Vodafone program can't turn it on. I tried leaving it on in Linux and then booting into Windows, to no avail.