They said this YM multiple log-ins steps kinda obsolete already but for me as a new finder I found it very useful while chatting with my clients and while doing some things for my Hectic Capiznon Bloggers 2009 contest. I just want to share this to all who doesn't know how this work yet.
A simple tutorial on how to log in YAHOO MESSENGER MULTIPLE LOG IN the hackers registry basic way.. ;)
1. Open registry editor (Start > Run > type "regedit").
2. Go to "HKEY_CURRENT_USER\Software\Yahoo\Pager\Test"
3. Create a new DWORD Value.
4. Name it "Plural".
5. Edit the DWORD Value to "1".
6. Close the registry editor.
Run Yahoo Messenger as many times as you want.
See my desktop below.