Make Multi Yahoo without any software or patch Run > Regdit > HKEY_CURRENT_USER\Software\yahoo\pager\ Test right click > New > DWORD value > Name the new registry key as "Plural" then Value Data 1 (decimal).

Adding a simple entry to the Windows Registry will let you run multiple instances of
Yahoo! Messenger simultaneously and sign in to as many accounts as you may have,
all from a single user account on the same computer.

1. Click Start
   
   
2. Click Run
   
   
3. Type regedit in the Open
   input box and hit ENTER key
   
   
4. Navigate
   to:
   HKEY_CURRENT_USER\Software\Yahoo\Pager\Test
   
   
5. Click New on the Edit menu, and then click
   DWORD Value
   
   
6. Type Plural, and hit the ENTER key to name the entry.
   
   
7. In the right pane, right-click Plural, and then click
   Modify.
   
   
8. In the Edit DWORD Value dialog box, type 1
   under Value data

Now run Yahoo! Messenger
as usual. Every time you click/double click the Yahoo! Messenger icon in your
Start Menu, on your Desktop or your Quick Launch a new instance of
Yahoo! Messenger will be started. You can now sign in to multiple Yahoo!
Messenger accounts and be notified of any new email you have on any of your
Yahoo! accounts.

Follow these steps. It will allow you to use multi yahoo messenger and sign in differeny ids at one time.

1. On your windows, click Start and select Run
2. On the box type regedit and click OK
3. On the left part of the page, double click HKEY_CURRENT_USER
4. Under it, double click Software
5. Under Software, double click yahoo
6. Under yahoo, double click pager
7. Under pager, double click Test
8. On the right part of the page, right click with your mouse, select new then select DWORD value.
9. A "New Value #"1 will appear, right click on this and click rename. Replace it with "Plural" and hit enter key
10. Double click Plural, and replace value data with 1 and hit OK.

Close the registry editor and restart your computer.

Please do rate my solution. Thanks

No need to download yahoo multi messenger. Just need to configure your system registry to let your system load as many yahoo messenger window and sign in as many user name you want at once.

Follow these steps.

1. On your windows, click Start and select Run
2. On the box type regedit and click OK
3. On the left part of the page, double click HKEY_CURRENT_USER
4. Under it, double click Software
5. Under Software, double click yahoo
6. Under yahoo, double click pager
7. Under pager, double click Test
8. On the right part of the page, right click with your mouse, select new then select DWORD value.
9. A "New Value #"1 will appear, right click on this and click rename. Replace it with "Plural" and hit enter key
10. Double click Plural, and replace value data with 1 and hit OK.

Close the registry editor and restart your computer.

Now try to open as many yahoo messenger window as you want and enter your multiple id and it will log on in every ym window you want.

If you bumped into can't sign in problem with yahoo messenger, you may want to check my tips on this.

Just follow the steps:

• Go to START->RUN-> Type ‘regedit’ and press ENTER.
• Then navigate to ‘HKEY_CURRENT_USER\Software\Yahoo\Pager\Test’
• Now in the right pane right click New->DOWRD Value. Name it as ‘Plural’.
• Now Double click the the Plural DWORD you created & set the value to 1

Hope that helps you. Good luck!