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
3. On the left part of the page, double click
4. Under it, double click Software
Software, double click yahoo
6. Under yahoo, double click pager
Under pager, double click Test
8. On the right part of the page,
right click with your mouse, select new then select DWORD value.
"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