EDX is a trigger mechanism for starting a QlikView reload or task from an external source, such as a scheduler or application. To start a task using EDX the QlikView Management API must be used and this is delivered in the form of a Web Service.
QMSEDX is a third party app designed to perform said mechanism.
QMSEDX is an open source tool that is developed by CwolfX on sourceforge where you can find more information and maybe support: https://sourceforge.net/p/qmsedx/wiki/Home/ Also keep in minde that as it is an opensource it could have other developers making there version available online, juste make sure to contact the one that made the version you are using
For custom developments. Documentation about QMS API is available at Qlik Help:
1. Go to https://help.qlik.com 2. Go to the "For Developers" section, select the QlikView version in the dropdown list and click the green button. 3. It will open Qlik Developer Documentation site, in the menu on the left scroll down to the last topic called "QlikView APIS and SDKs" and click on it. 4. It will show a webpage where the APIs and SDKs are listed, you would need to select QMS API reference link.