Case 1 : Connecting Windchill with SAP PI web services.
This depends on what profile the publisher has been added.In most of the cases, the data is passed on to JMS with the help of the workflows. On another side, it is collected by SAP.
Case 2 : Update some database with windchill. Fetch information from that database in other Applications.
This depends on the DBUser(mostly admin) credentials that are set up in wt.prperties. I don't think,the normal user would be able to change anything in database
Case 3 : Sharing Windchill Data with other Application with Excel, text, XML or other file Formats.
Except for Navigate View license, all users should be able to share the data from Windchill as export.I am not sure if you are looking at any integration of these with Windchill
Hope this helps.
