How do I get Windows 7 to display in Target Display Mode on IMac

I am increasingly frustrated by my inbability to get my Mac Mini running Windows 7 to display on my late 2013 27" IMac using Target Display mode.
My setup:
1.  IMac 27" Late 2013 running OSX 10.9.2 with all the latest drivers as of Mar 7, 2014.
2.  Mac Mini Server Mid 2011 running Windows 7 SP1, 64bit, all the latest Windows drivers as of 3/7/14, using the latest BootCamp Drivers for this machine, ver 5.1 downloaded 3/5/14 to this machine using Boot Camp utilities in its OSX mode.
3.  Connected via Apple Thunderbolt cable.
My process is as follows:
a. Turn on the IMac, boot up in the  normal manner, preparing it to run in Target Disk Mode in OSX.
b.  Turn on the MacMini boot up via BootCamp,  in the normal manner in to Windows 7.
c.  When Both machines are on and connected via their Thunderbolt ports, I enter cmd-F2 on the IMac keyboard to enter Target Disk Mode.
Nothing happens.
I use this IMac to display my MacBook Pro in OSX, so I know it is working, but I can't see where the problem is.
I have reviewed all of the Apple support information and followed it explicitly, to no avail.
When I have called the Apple support team, I get little help, they assert that they can't troubleshoot because it is not all Apple hardware/software (everything including the Thunderbolt cable is Apple except for the Windows OS)
Any suggestions will be welcome...
Thanks!

I have finally achieved some clarity on how Target Display Mode works, or rather doesn't work.
And I have been mistaken in some of my prior comments.
Target Display Mode is a function of the host machine, at this point only the IMacs.  And it is only available when the host machine is running OSX.
But the most recent Thunderbolt versions of the IMac have been significantly dumbed down in this functionality.
The prior generation of IMacs whose video was supported through the Mini Display Port supported almost any input from a Mini Display Port compliant Computer through the use of various mechanical adapters, and certainly from any Mac Hardware or software combination.  It was a very versatile setup, and the IMac in this manner could serve as an absoloutely beautiful monitor for a wide variety of hardware/software combinations.
When the current version of the IMac was deployed using the Thunderbolt ports for input for external video, we apparently left a world of standards based video input and entered the world of Apple proprietary video. 
The current model of IMacs with thunderbolt video have a very limited functionality in Target Display Mode compared to those of us who have used it previously. and it only functions when the client machine is running OSX. 
No other video input from any source will display. 
I am not quite clear on the reasons one would want to display OSX on an OSX native machine, but you can do it.  I guess MacBook Pro or Air running OSX will now display on the IMac if that is your need.
Likely the most likely need for Target Display Mode for the rest of us is to run Windows on an external machine and display the video on the IMac, as we have been able to do with the prior generations of IMacs for several years now.
Apple has been unwilling to distribute the technical specifications of its video input requirements in Target Display Mode, (other than to assert it requires OSX), and these technical specifications appear to be proprietary. 
I have personally unsuccessfully  tried to  display the output from both Windows 7 and a Windows 8 machines running from a Windows thunderbolt port into  a thunderbolt port on a current model IMac using Target Display Mode.
Unfortunately, there are still a few applications that won't work in Mac world and require a native Windows machine.  My current need is to run Dragon Naturally Speaking via Citrix to a remote Citrix server and a Windows app.  Parallels and VMWare Fusion do not work, nor does the OSX version of Dragon Dictate function via Citrix.  So I am stuck.
I hope that Apple, so long a leader in technology, will restore the functionality it abandoned when it embraced thunderbolt as its only video iniput in Target Display Mode.
Thanks!

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