strange,two additional items appear in my Applications menu

[big]

hi folks,
Tow additional items appear in my Applications menu ( under Internet submenu ),which annoys me so much.They are "Avahi SSH server Browser" and "Avahi VNC Server Browser".I checked the USE flags of avahi package,and i found the the "dbus" had been enabled,so i disabled it and re-emerged avahi, the two items disappeared,however when i rebooted the system,i couldn't login through gdm with the log said "pam_nologin(gdm:auth): cannot determine username",so i had to re-enable the "dbus" flag.Further more when i emerged avahi with dbus flag disabled, i couldn't re-emerged gdm and the process would terminated for lack of a .lib file which i now guess depends on the dbus flag.So my questions is what's the function of the two applications and Do i need it?If not,i will delete the desktop files of the above two items
Any help will be appreciated.
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be big,no bug

[EvaSDK]

please report this problem on bugs.gentoo.org

To disable avahi auxiliairy gtk programs you might try disabling the gtk use flag on avahi using /etc/portage/package.use