You can make the iexplore.exe process to a single instance by restricting the TabProcGrowth and Identify\Spy the correct window with arguments like Windows Title.
Open the registry editor in elevated rights.
Go to the HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main section and locate the TabProcGrowth key. If the key does not exist, create a new DWORD (32-bit) Value or String Value and name it as TabProcGrowth accordingly.
Set the value of the TabProcGrowth key to 0. This will instruct IE to open all of the tabs within the same iexplore.exe process.
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