How to create own windchill client software ?

Hi Guys,

We have a customer who wants to integrate its software with Windchill... Therefore I have the next question : does anybody know - is there any possibility to create something similar to SolidWorks / AutoCad / CATIA / etc... addi-in ( that are provided with Windchill Workgroup Manager software ) for remote work with Windchill ? Or at least if there is a way to develop some client software for such purposes in general? If so, then in which way should we look ?

Also it is interesting to know the answers for the each type of data - CAD and not CAD.

Thanks in advance,

Alexandr