How to chat with multiple profiles using one account in yahoo

At times I play pranks on my friends by chatting with them in many windows at a time with different screen names. Let’s see how

• Yahoo provides us my profile option to create different profiles. With the help of that you can create and edit number of profiles. Also you can make your profile active or inactive.
• But make sure that keep your e-mail id private so no one can understand that you are same person because yahoo provide you only one e-mail account.
• Sing-in with any profile that will your primary account for that time.
• Open your instant message window; you can see send as option with your profile accounts.
• Send message to any person using one profile; close it before he/she replies you, again open instant message window and send message to that same person using your another profile, so he/she will get two message windows on his/her desktop.
• You can also put different image on display image of each window.
• Like this you can send any number of instant message windows to one person at a time. And he/she will chat with you as different persons.