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

To perform this trick u need firefox mozilla browser

======== Trick to Multilogin in firefox ============

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\mozilla firefox\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.........