RUNNING 2 YAHOO MESSENGERS
Significance - you can log in 2 or more YM accounts at the same time
Procedure -
1) Go to Start -> Run
2) Enter regedit
3) Locate HKEY_CURRENT_USER\Software\Yahoo\Pager\Test
4) Right click on the right frame and select New -> DWORD Value, name it Plural
5) Right click on the newly made registry value and select Modify then input 1 on the blank space labeled Value data
6) After accomplishing the previous processes, reconnect your YM account
7) You can now open 2 different YM accounts at the same time
Here are the values you need to enter to be able to run multiple YM accounts :
1 - 2 YM accounts
2 - 3 YM accounts
3 - 4 YM accounts
4 - 5 YM accounts
5 - 6 YM accounts
*and so forth*
Note:
"Tweaking the Windows Registry is better, but be careful"

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"Every little thing is wonderful at the beginning, it just depends on how you look at things to make it still wonderful at the end.." -emj0zar