Ok, here comes the info on how this works.
With a copy of Phantasy Star Online & the Broadband adapter, it is possible to play backups of games in conjunction with your PC.

Since Phantasy Star online is an online game, its set to listen to the Broadband adapter for instructions etc from the PSO servers.

By connecting the adapter to your computer and using a program called "The Euroasia Loader" your computer will interpret commands from the Gamecube and using an exploit in the PSO game can send data directly into the ram. The Euroasia loader then plops a little program in the ram that tells the gamecube not to read data off the optical drive, but to read it off the broadband adapter instead. So the GameCube requests all its data off the broadband adapter, and thus off the computer. The computer running the euroasia loader can interpret these commands and sends the requested data via a copy of a game ISO on the hard drive.
Its just that simple.

Heres the .nfo file of the euroasia loader:

Code:
.       .                                                           .       . 
: /    /                .                                 ___:.      \    \ : 
|// _//________.___ ____:____________  _____.__________   \  /   _____\\_ \\| 
|/ | /   _     /   |    |    _      /__\__   \      __/____\/____\__   \ | \| 
/ /|/    /    /    |    |    /     /     _    \______     /_/\     _    \|\ \ 
\ \//    ____/     [    |    \    <      \    /\    /    /    \    \    \\/ / 
|\ / ______\ \__________|_____\   /_____________\_______/______\________ \ /| 
| \   \ ----  --------- : ---- \____\ ----------- ----- -------- ---- /   / | 
|  \\  \                                                             /  //  | 
|   /  /        IS PROUD TO BRING YOU ON OCTOBER 12TH, 2003          \  \MTX! 
| //  /                                                               \  \\ | 
|/   /              >>> Animal Crossing Loader 1.1 <<<                 \   \| 
/  //                                                                   \\  \ 
. /   COMPANY...: Nintendo            -   SYSTEM....: GCN\DOS32           \ . 
://   ORIGIN....: USA                 -   SIZE......: 49.6K               \\: 
|/    LANGUAGE..: English             -   FILENAME..: EUR-ACL1.ZIP         \| 
|                                                                           | 
`--/ /-----------------------------------------------------------------\ \--' 
.-/ /->> RELEASE NOTES: <<----------------------------------------------\ \-. 
|                                                                           | 
|                                                                           | 
|     Eurasia Animal Crossing Loader V1.1.  Now supports all Animal         | 
|     Crossing GCMs and several others.                                     | 
|                                                                           | 
|     When using on GCMs that use excessive BBA streaming, memory card      | 
|     access may be less reliable or cause a hang.  This does not apply to  | 
|     any version of Animal Crossing or games like Luigis Mansion because   | 
|     streaming from BBA does not occur every second.                       | 
|                                                                           | 
|     Games like F-Zero, that stream every second, you may want to remove   | 
|     the memory card completely to stop possible hanging when it is        | 
|     accessed.                                                             | 
|                                                                           | 
|     Despite the save limitations of some games you may still enjoy them   | 
|     until a workaround is developed.                                      | 
|                                                                           | 
|         Enjoy!                                                            | 
|                                                                           | 
`--/ /-----------------------------------------------------------------\ \--' 
.-/ /->> TOOL NOTES: <<-------------------------------------------------\ \-. 
|                                                                           | 
|                                                                           | 
|     Play Animal Crossing (USA) GCM on your Gamecube with BBA/PSO exploit  | 
|                                                                           | 
| Loader Files:                                                             | 
|                                                                           | 
|     EUR-ACL1.EXE - PC Animal Crossing Loader 1.1                          | 
|     EUR-ACL1.DOL - GC Animal Crossing Loader 1.1                          | 
|                                                                           | 
| Setup:                                                                    | 
|                                                                           | 
|       In PSO Network provider setup menu..                                | 
|                                                                           | 
|     * Change IP address of GC to 192.168.1.32                             | 
|     * Change Default Gateway and Primary DNS to 192.168.1.100             | 
|                                                                           | 
|       In Windows..                                                        | 
|                                                                           | 
|     * Change your PC IP to 192.168.1.100                                  | 
|                                                                           | 
|                                                                           | 
| Usage:                                                                    | 
|        From DOS Run EUR-ACL1.EXE with the Animal Crossing GCM..           | 
|                                                                           | 
|         > EUR-ACL1.EXE EUR-ACGC.GCM                                       | 
|                                                                           | 
|                                                                           | 
|       Upload EUR-ACL1.DOL to the GC with PSUL Version 1.1                 | 
|                                                                           | 
|       The Eurasia intro will boot on GC, you can change boot method       | 
|       from A/B using D-pad, then press START.                             | 
|                                                                           | 
|       If everything is working correctly the DOS screen will begin        | 
|       to fill with dots. The TV screen should go from loading, black,     | 
|       Red Nintendo Logo, black screen, sound, title screen, music.        | 
|                                                                           | 
|       On some sytems the entire game will load in 1 minute, on other      | 
|       systems this process may take several minutes! Please be patient,   | 
|       As long as dots are filling the DOS screen then Animal Crossing     | 
|       is loading.                                                         | 
|                                                                           | 
|       If you are having problems with hanging, or the console is filling  | 
|       up with X's and transfer rate is very slow, try using the delay     | 
|       switch to slow down transfer rate from PC.                          | 
|                                                                           | 
|       Delay usage:    eur-acl1.exe eur-acgc.gcm -d10 -f16                 | 
|                                                                           | 
|       Delays for 10ms every 16 packets.                                   | 
|                                                                           | 
|       If no -f switch is given the frequency of delay will default to     | 
|       every one packet which is far slower and perhaps no more reliable   | 
|       that a given frequency value.  Experiment to find the optimum       | 
|       settings for your system if you are having long loading times.      | 
|                                                                           | 
|                                                                           | 
`--/ /-----------------------------------------------------------------\ \--' 
.-/ /->> NICE -----: <<-------------------------------------------------\ \-. 

    SUPPORTED 

---------------------------------------------------------------------------------- 
DOL-GAFE-USA  A    Animal Crossing             ~1 min. initial load. 
                                               Game loads into RAM. No more 
                                               loading after title screen. 
---------------------------------------------------------------------------------- 
DOL-GAEJ-JAP  A    Animal Crossing E+          ~2 min. initial load. 
                                               Game loads into RAM. No more 
                                               loading after title screen. 
---------------------------------------------------------------------------------- 
DOL-GLMP-EUR  B    Luigi's Mansion             ~2 min. initial load. 
                                               Intro sound pops/stutters. 
                                               <2 sec. load between doors. 

   UNSUPPORTED... 

---------------------------------------------------------------------------------- 
DOL-GFZJ-JAP  B    F-Zero GX                   ~2 min. initial load. 
DOL-GFZE-USA  B    F-Zero GX                   Short loading times in-game. 
                                               Minor audio pops/stutters in-game. 
                                               <15 sec. load for menus. 
                                               Reports memory card as full but 
                                               does not freeze. 
---------------------------------------------------------------------------------- 
DOL-GWRP-EUR  B    Wave Race: Blue Storm       ~1 min. initial load. 
                                               Short loading times in-game. 
                                               Audio pops/stutters in-game. 
                                               Recommend remove memory card. 
---------------------------------------------------------------------------------- 
DOL-GSWE-USA  B    Rogue Leader                ~5 min. initial load. 
                                               Recommend remove memory card. 
---------------------------------------------------------------------------------- 
DOL-GMDE-USA  A    Madden NFL 2002             ~2 min. initial load. 
                                               Choppy FMV/graphics in-game. 
                                               Recommend remove memory card. 
---------------------------------------------------------------------------------- 
DOL-GSAP-EUR  B    Starfox Adventures          ~1 min. initial load. 
                                               Choppy FMV/audio cut-scenes. 
                                               Recommend remove memory card. 
---------------------------------------------------------------------------------- 
DOL-GDMP-EUR  B    Disney's Magical Mirror     ~1 min. initial load. 
                   starring Mickey Mouse       Short loading times in-game. 
                                               Minor audio pops/stutters in intro. 
                                               Minor audio/graphics pops in-game. 
---------------------------------------------------------------------------------- 
DOL-GRHE-USA  B    Rayman 3: Hoodlum Havok     ~3 min. initial load. 
                                               Choppy FMV/audio/graphics in-game. 
                                               Recommend remove memory card. 
---------------------------------------------------------------------------------- 
DOL-????-USA  B    Skies of Arcadia            ~1 min. initial load. 
                                               Short loading times in-game. 
                                               Choppy FMV/intro. 
---------------------------------------------------------------------------------- 
DOL-GTSE-USA  B    TimeSplitters 2             ~1 min. initial load. 
                                               ~30 seconds for each load screen. 
                                               Reports memory card as corrupt 
                                               but does not freeze. 
---------------------------------------------------------------------------------- 

        THIS MAY WORK ON OTHER GCMS.  REMEMBER TO TRY BOTH BOOT METHODS. 
        AND REMOVE MEMORY CARD IF ENCOUNTERING RANDOM CRASHES WHEN IT 
        IS BEING ACCESSED. 

---------------------------------------------------------------------------------- 


.-/ /->> APPLICATION INFO: <<-------------------------------------------\ \-. 
|                                                                           | 
|     Interested in being a part of Eurasia?  We are currently looking      | 
|     for people to join our team.  We have a strong belief in group        | 
|     friendship and we make an effort to ensure that all members get       | 
|     exceptional benefits. If you fit into any of these categories,        | 
|     please contact us for membership information:                         | 
|                                                                           | 
|     * Suppliers of unreleased console games around the world. If you      | 
|       have access to games and have spare time, we can train you and      | 
|       give you access to the necessary tools and hardware to make         | 
|       your job easier.                                                    | 
|                                                                           | 
|     * Site affiliations worldwide. If you host a site and are looking     | 
|       for a great affiliation, contact us to establish a relationship.    | 
|                                                                           | 
|     If you fit into any of these categories, please contact us.           | 
|                                                                           | 
`--/ /-----------------------------------------------------------------\ \--' 
.-/ /->> GREETS: <<-----------------------------------------------------\ \-. 
|                                                                           | 
|     Crazy Nation, Echelon, Kalisto, Lightforce, Mode 7, Nightfall,        | 
|     Oldskool, Paradox, Rising Sun, RSiSO, StarCube, SAC, and Venom.       | 
|  \                                                                     /  | 
`--/ /-----------------------------------------------------------------\ \--' 
.-/ /-------------------------------------------------------------------\ \-. 
|/  /\_ __   ESTABLISHED IN 1997    ___:.                          __ _/\  \| 
/ // ______._ __:____.  _____:____. \  /_____.  _____.  ____:___._______.\\ \ 
\ \_|   ___/ |  |  _  \_\__  |  __/__\/_\__  |_ \___  \/    |    \___   |_/ / 
|\ \_   __/  |  |  /  <   _  |___   //\   _  _/  /  __/  |  |  |  \__   _/ /| 
|\  |_\___\_____|__\___\_____|_____/___\_____|  /_____\_____|_____/___/_|  /| 
: \    \        :            :                              :        /    / : 
   \\   \                       FOR PLEASURE, NOT PRESSURE!         /   // 
    \\  \\                                                         //  // 
          \                                                       /
_________________________
C++ Should Have Been Called "D"