Windows 8 and the share button, is it possible to add a regular app there?

Question

Windows

In Windows 8, there is a right slide menu "Search", "Share", "Start", "Devices", "Settings".
Interested in the following question, is it possible in an easy way to add your program (in fact, a script) to the "Share" section, which will perform its action.
I will also be grateful for information about how this function is called in the documentation or on those. language, it will be easier to find.
Is it possible to embed your script there? In python for example. Or is VB or C# required there and you need to write a full-fledged application?
It would be convenient to take a screenshot and immediately process it in your program.
Or assign a different interaction between programs.

Answer 1

Here is the share contract documentation