Topic: My contribution.
Here is the code of the ladders, and I hope someone help me in the questions I asked. 
Modify the files Channel.c y bnet_protocol.cpp
Channel.c line=1580
/* well... unfortunatly channel_get_name never returns NULL but "" instead
so we first have to check if user is in a channel at all */
if ((!conn_get_channel(c)) || (!(channel = channel_get_name(conn_get_channel(c)))))
return -1;
if ((conn_get_clienttag(c) == CLIENTTAG_WARCRAFT3_UINT) ||
(conn_get_clienttag(c) == CLIENTTAG_WAR3XP_UINT))
newflags = W3_ICON_SET;
else if (account_get_auth_admin(acc,channel) == 1 || account_get_auth_admin(acc,NULL) == 1)
newflags = MF_BLIZZARD;
else if (account_get_auth_operator(acc,channel) == 1 ||
account_get_auth_operator(acc,NULL) == 1)
newflags = MF_BNET;
else if (ladder_rank == 1)
newflags = MF_1TH;
else if( ladder_rank == 2)
newflags = MF_2TH;
else if(ladder_rat < 1000 && ladder_rat > 0)
newflags = MF_SAPO;
else if((ladder_rat > 999 && ladder_rat < 1035) || (ladder_rat == 0))
newflags = MF_EME;
else if(ladder_rat > 1034 && ladder_rat < 1070)
newflags = MF_E;
else if(ladder_rat > 1069 && ladder_rat < 1105)
newflags = MF_EMA;
else if(ladder_rat > 1104 && ladder_rat < 1140)
newflags = MF_DME;
else if(ladder_rat > 1139 && ladder_rat < 1175)
newflags = MF_D;
else if(ladder_rat > 1174 && ladder_rat < 1210)
newflags = MF_DMA;
else if(ladder_rat > 1209 && ladder_rat < 1245)
newflags = MF_CME;
else if(ladder_rat > 1244 && ladder_rat < 1280)
newflags = MF_C;
else if(ladder_rat > 1279 && ladder_rat < 1315)
newflags = MF_CMA;
else if(ladder_rat > 1314 && ladder_rat < 1350)
newflags = MF_BME;
else if(ladder_rat > 1349 && ladder_rat < 1385)
newflags = MF_B;
else if(ladder_rat > 1384 && ladder_rat < 1420)
newflags = MF_BMA;
else if(ladder_rat > 1419 && ladder_rat < 1455)
newflags = MF_AME;
else if(ladder_rat > 1454 && ladder_rat < 1499)
newflags = MF_A;
else newflags = MF_AMA;
if (conn_get_flags(c) != newflags) {
conn_set_flags(c, newflags);
channel_update_userflags(c);
}
return 0;
}banet_protocol.h line=
/* Blizzard Entertainment employee */
#define MF_BLIZZARD 0x00000001 /* blue Blizzard logo */
/* Channel operator */
#define MF_GAVEL 0x00000002 /* gavel */
/* Speaker in moderated channel */
#define MF_VOICE 0x00000004 /* megaphone */
/* System operator */
#define MF_BNET 0x00000008 /* (old: blue Blizzard, new: green b.net) or red BNETD logo */
/* Chat bot or other user without UDP support */
#define MF_PLUG 0x00000010 /* tiny plug to right of icon, no UDP */
/* Squelched/Ignored user */
#define MF_X 0x00000020 /* big red X */
/* Special guest of Blizzard Entertainment */
#define MF_SHADES 0x00000040 /* sunglasses */
/* unused 0x00000080 */
/* Use BEL character in error codes. Some bots use it as a flag. Battle.net */
/* stopped supporting it recently. */
#define MF_BEEP 0x00000100 /* no change in icon */
/* Registered Professional Gamers League player */
#define MF_PGLPLAY 0x00000200 /* PGL player logo */
/* Registered Professional Gamers League official */
#define MF_PGLOFFL 0x00000400 /* PGL official logo */
/* Registered KBK player */
#define MF_KBKPLAY 0x00000800 /* KBK player logo */
/* Official KBK Referee */
#define MF_KBKREF 0x00001000 /* KBK referee logo */ /* FIXME: this number may be wrong */
/* unused... FIXME: how many bits work? 16 or 32? */
/*Ladder Categories*///****************
#define MF_SAPO 0x20000000 /*Sapo Category*/
#define MF_EME 0x40000000 /*E- Category*/
#define MF_E 0x02000000 /*E Category*/
#define MF_EMA 0x04000000 /*E+ Category*/
#define MF_DME 0x00200000 /*D- Category*/
#define MF_D 0x00400000 /*D Category*/
#define MF_DMA 0x00020000 /*D+ Category*/
#define MF_CME 0x00040000 /*C- Category*/
#define MF_C 0x00002000 /*C Category*/
#define MF_CMA 0x00004000 /*C+ Category*/
#define MF_BME 0x00000200 /*B- Category*/
#define MF_B 0x00000400 /*B Category*/
#define MF_BMA 0x00000020 /*B+ Category*/
#define MF_AME 0x00000040 /*A- Category*/
#define MF_A 0x00000004 /*A Category*/
#define MF_AMA 0x00000002 /*A+ Category*/
#define MF_1TH 0x10000000 /*1th Place Category*/
#define MF_2TH 0x80000000 /*2th Place Category*/
/*Ladder Categories*///****************
/****** Channel Flags ******/
/* flag bits for MT_CHANNEL message */
#define CF_PUBLIC 0x00000001 /* public channel */
#define CF_MODERATED 0x00000002 /* moderated channel */
#define CF_RESTRICTED 0x00000004 /* ? restricted channel ? */
#define CF_THEVOID 0x00000008 /* "The Void" */
#define CF_SYSTEM 0x00000020 /* system channel */
#define CF_OFFICIAL 0x00001000 /* official channel */
/*
* Examples:
* 0x00001003 Blizzard Tech Support
* 0x00001001 Open Tech Support
* 0x00000021 Diablo II USA-1 or War2BNE USA-1
* 0x0000000D warez
* 0x00000009 The Void
* 0x00000001 War2 Ladder Challenges or Diablo II PvP
* 0x00000000 clan randomchannel
* 0x00000000 randomchannel
*/
/************************************
