ICF
From EMule Wiki
Internet Connection Firewall (ICF) Support (a.k.a. Windows Firewall)
Adds and deletes the eMule ports on the Internet Connection Firewall (Windows Firewall) at start and close of emule. This guarantees that we will be accessible to other eMule users. (High id)
The code in the mods enhances the actual official eMule ICF code adding more features.
First seen in the emulEspaƱa Mod (MoNKi), is available in most Morph based mods and Neomule, and also partly in official.
[edit] Note
Most of this code does not seem very effective starting from XP SP2. The morph installer solves this my using the "netsh" to poke a hole in the windows firewall.