
I will give you a short tutorial how to make Yahoo Multi ID aka YM Multiple Instance through Register Tweaks and also use Multi ID Software. This trick I tested only in Windows XP, Windows Vista and Lower Version. Here is the steps:
- Open Register Edit trough:: Start Program, Run, regedit, enter
- On Register Windows Folder go to HKey_Current_User\ Software \Yahoo\Pager\Test
- Add Dword value by right click on the windows registry editor than chose New, Dword Value
- On Edit Dword Value choose hexadecimal, value name: plural, value data: 00000020 (or just 20)
- Push OK button, restart your Computer and then open the YM shortcut icon as many as you wish to open the Multi ID Windows Users.

Use YM Multiple Instance Software
If you hard to understand the step above, just use the software below that Patch the Multi ID. Just run it and then you can obtain Yahoo Multiple Instance.
Download Multi ID
You can also try to use Multi ID aka Polygamy ID by running Yahoo Messenger Tweaker
ps: multi ID image cropped from http://faikai.files.wordpress.com/2008/05/multiple-ym.jpg
Related Post:- Create GTalk Multiple Instance
- Multi ID Yahoo Messenger Download
- Multi ID ICQ Multiple Instances Polygamy Ads Remover
- QNext – Multi Mobile n Desktop Instant Messenger client: IRC, iChat, Yahoo, Gtalk, n more
- Multi Skype Launcher – Run and Manage Multiple Skype Accounts on Single Computer
- Mundu Messenger – Paid Multi Protocol Client for Mobile Phone / Free in iPhone
Надо попробовать))