Login with multiple ids at the same time in orkut , gmail , yahoo...

To perform this trick u need firefox mozilla browser

Step 1:

open system properties(by right clicking my computer), choose tab advanced, click to environment variables button. in system variables section, click new. type this information to each textbox.
variable name: moz_no_remote(should be all small letter)
variable value: 1
press ok to close all windows.

step 2:

open firefox icon's properties(from desktop and quick launch).
add extension -p to command line
(like "c:\program files\mozillafirefox\firefox.exe" -p).
Press ok.

while starting firefox u have to create two separate profiles of firefox so that u can login to two accounts of any(orkut,yahoo,rediff or anything else).......

For three logins create three profiles of firefox.........