unable to Authenticate the session while opening multiple Instance in IE8

IE 8 Acessing or opening mutiple Instance simultaneously Unable to Authenticate the session

This is an IE Issue.

Solution :
Step 1:

Click on start menu  type run in the search box
You will get a  dialog box: type the below command in run prompt and hit ok or enter Key
iexplore -noframemerging

Another IE explorer will open. open the another ERP Instance.

or

Step 2:

Create a shortcut of IE 8 on your desktop.
Right click on IE icon
Click on Shortcut
in Target field :- append -noframemerging
e.g below:
"C:\Program Files\Internet Explorer\iexplore.exe" -noframemerging

Now click on theIE  shorcut created on desktop and open Instances.

Using IE8 to access two EBS Instances runs in error "Unable To Authenticate Session" [ID 1098563.1]