You can save your passwords and usernames for web pages that require
HTTP certification or a proxy certification.

The configuration file is designated in the "passwd_file" parameter.
The format of the configuration file is as follows

machine hostname
port    port number
path    local part
realm   realm string
login   username
passwd  password
proxy

Each configuration begins with machine and ends at the next machine.
You can omit port, path and realm.

proxy designates settings for proxy certification.

If passwd_file is readable from other users, w3m shows a warning for
that.  If you can not set the permission for the passwd_file because
of the restriction of your OS, you can suppress the warning with the
setting of disable_secret_security_check.