First off this is a C&P from
http://www.gamerzplanet.net/forums/showthread-t_124049.html
1) Go to ur Flyff Folder and do a ShortCut of Neuz.exe
2) Right-Click on the Short-Cut and then properties, on target add:
"C:\Program Files\GalaNet\Flyff\Neuz.exe" sunkist
3) Move the Short-Cut to the start menu
4) Run the Short-Cut and whent the GG is Autenticating Run again the Short-Cut, u need do it fast thats why u ned to move the short-cut to the start menu
once again this IS a C&P. just hoping to help some people out. Also you have to have 2 accounts to do this it will not let you open the same account twice. also note that it may take a few tries. But it does in fact work if you get the timing right.