All Windows
This setting controls whether Internet shortcuts are opened in an existing available Internet Explorer window or whether a new window should be spawned.
Open your registry and find or create the key below.
Create a new DWORD value, or modify the existing value, called "AllowWindowReuse" and set it according to the value data below.
Exit your registry; you may need to restart or log out of Windows for the change to take effect.
Registry Settings
User Key: [HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]Value Name: AllowWindowReuse
Data Type: REG_DWORD (DWORD Value)
Value Data: (0 = new window, 1 = existing window)
