Some Office bound window into one main window

In task bar found 2 process but can only open in 1 window (cannot simultaneous display 2 windows).

To solve this issue.
Only Choose

TOOLS --> OPTIONS -->VIEW TAB and put a check in the option that says "Windows In Taskbar"

Regards,
Rollinnow you can simultaneous open 2 window .

Details from
http://forums.techguy.org/business-applications/589241-excel-multiple-windows.html

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Lastly After I test again.
I can't open 2 work (from link of file that have data) in separate window except
I open new blank worksheet then It will show in new window.