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You can find here some information to start making server-side source
modifications.
Hercules has a multi-process architecture. It runs three different processes:
login-server , char-server and map-server.
Login server : receives the login packet, checks if account exists and
if the password is correct. If all is OK, the connection is then passed to the
char-server.
Char-server : controls all the character related, Guild, party, pet,
inventory etc.
The last one is the map-server , which controls char and NPC position,
chats, skills, exp etc.
Before you start modifying [Hercules], you should better take a look first
on [:Category:Source_Functions]. Remember, it's necessary to Compiling [Hercules] after a source modification. You can also find
information about [Packets].
Also can take a look at modifications made by other users.