Here is all I know about the Software Developer's Kit:
- It allows you to customize the Epicor itself by adding new tables, business objects, and forms.
- It seems to be geared more for developing features which run inside of Epicor, as opposed to integrating Epicor with other systems.
- There is no trial version to try before you buy.
- The best place to find out more is to ask your sales rep. He or she should be able to email you some PDFs regarding the capabilities.
- It's not cheap.
If anyone has any experience with it, please comment below, or, if you have something more to say, I can post an entry for you.