Mantis 1.1.7 or higher includes a SOAP API named Mantis Connect. This is an add-on you can install for earlier version of Mantis by going to http://www.futureware.biz/mantisconnect/ and installing the PHP packages into your Mantis server. This Squeak project is a client wrapper of the Mantis SOAP API provided by Mantis Connect. The Mantis Connect SOAP API is pretty rich in that you can do about anything to Mantis tickets that you can do with the web interface. You need the SOAP-Core package installed in Squeak to use this as I leverage the SOAP client machinery of that package.