Have you ever though of running multiple "yahoo messenger" clients to log in with your different yahoo accounts in one computer? This tutorial will show you how to run multiple "yahoo messenger" clients simultaneously in your computer like in the image above.
Step 1: Install Yahoo Messenger
If you don't have yahoo messenger in your computer, you can get it in download sites like http://www.filehippo.com/download_yahoo_messenger/
Step 2: Open Registry Editor
To open "registry editor", go to start>run(or Win+R) then type "regedit". This will open the registry editor.
Step 3: Go to "HKEY_CURRENT_USER/Software/yahoopager/test"
Go to "HKEY_CURRENT_USER/Software/yahoopager/test". Click on the "test" folder and you will find only the "default" registry value.
Step 4: Add a New Registry Value
Right click in the registry editor and add a new "DWORD (32-bit)" value then name it as "plural".
Step 5: Configure the Value of "plural"
Double-click on "plural" and change it's value to any non-zero number(preferably '1').
Step 6: Close the Registry Editor
After configuring, close the registry editor to apply the changes. Now, try to open multiple "yahoo messenger" client.