Yahoo!Messenger Multi ID

do you know that is moment chating use yahoo! messengger can use more than 1 id. . . . this the trick. . . . without software or tools addition. . . .

1. click start > run… > cmd
2. choose tree hkey_current_user > software > yahoo > fence > test
3. in panel right side, click right > new > dword value
4. give name plural in key and 1 in value