Windows CE 7 - is one application for multiple handy terminal devices possible?

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embedded

C++

MFC

WinCE

Our client decided to use Handy terminals (CASIO DT-X100-10J) and asked us to provide input support for our main desktop application through these handy terminals.

So our company decided to develop a Win CE 7 (the OS version installed in the above CASIO device) application which will read and store the data, and finally output it as CSV or some other such format. This output will be fed as input into our main desktop application which will connect to a database and store this data for later retrieval/modifications.

Now, this is the first time we are trying to create application for the embedded environment and it was decided that I would search and study about the dev environment setup and other stuff related to it. After a lot of googling, I came up with some info that we could do the development in visual studio but that we needed some additional tools.

The question that I could not get a clear solution to is whether we absolutely need the SDK provided by the manufacturer (in this case, CASIO) for the development? Wont that bind the application to the specific CASIO model? What I would like is to be able to provide our customers with something like "we support (ideally any handy terminal device OR) so and so range of devices, provided that the devices run Windows CE 7 (or some such specific version)."

I understand that the handy terminals vary in their hardware from ARM to x86/64 and also their other modules. But writing the code once and then compiling it for different platforms would be easier for future maintenance.

Is it possible at least to make a common application (and compiling/building it for different platforms) that runs on multiple handy terminals as long as the devices have the same OS version; or at least parts of it such as the UI and Business logic into a common single application?

What I have tried:

I googled about it,but all the instructions and tutorials i found were for one or the other specific device and the instructions said about getting the SDK from the OEM. Creating applications for each specific device would make future maintenance complicated and difficult.


Update:
My current dev env tools list for the above looks like this:

1) Visual Studio 2008 + SP1
2) Microsoft Windows Mobile Device Center 6.1
http://www.microsoft.com/downloads/details.aspx?FamilyId=4F68EB56-7825-43B2-AC89-2030ED98ED95&displaylang=en
3) Visual Studio 2008 SP1 patch for WEC7
https://www.microsoft.com/en-us/download/details.aspx?id=11935
4) Visual Studio 2008 SP1 patch for WEC7 (ATL)
https://www.microsoft.com/en-us/download/details.aspx?id=27729
5) Microsoft Virtual PC
https://www.microsoft.com/en-us/download/details.aspx?id=3702

Any suggestions/changes to this tools list along with the answer to the above question is deeply appreciated. Thank you.