Logging into Messenger 11 on more than one device
If you are using Messenger 11 on more than one device, you can sign in to multiple Messenger sessions. You can even sign in to two Messenger sessions at the same time while using both your ID and your ID alias. You can also use this feature with Yahoo Messenger in Mail in the newest version of Yahoo Mail.
While logged into multiple sessions, only the session you are currently using will be active. So, if one of your contacts tries to call or invite you to a video call, you will only receive the invitation on the system you are actively using.
The same is true for chatting with your Facebook friends through Messenger 11. If you are signed into Facebook chat through Messenger on a second system, you will not be logged out of Facebook chat on the first system. However, you will only receive messages on the system you are actively using.