Simply Can we set a backdoor in windows ?
Yes we can :) .
Backdoor actually means maintaining access for future use.
Open your command prompt (run as administrator in win 7/vista).
Type the following command :
Syntax : net user account.name *
Example: net user administrator *
and hit enter. Set any password for that account.
2. Then click on 'Edit' in security tab to edit permissions. Click on 'Administrators' , give it full control
and apply changes.
Okay its done now.
Now try replacing the orignal sethc.exe with our sethc.exe (got by renaming cmd.exe).
Press shift key five times and hopefully you would get command prompt on the screen instead of sticky keys.
Enjoy Command prompt at logon screen...
So do not forget to set this backdoor whenever you would get friend's laptop for a few minutes... :)