SOAP stands for Simple Object Access Protocol and is an XML-based standard for requesting and sending information in the form of Web Services, usually over HTTP. A complete specification of the protocol is available at w3.org, and a less technical description can be found at Wikipedia.
Presence support for SOAP
Presence supports incoming and outgoing SOAP requests which means it can be integrated as part of any product that supports a Service Orientated Architecture.
Incoming SOAP Requests to Presence
Tasks can be made available as Web Services by adding them to the Web Service Live Tasks Queue. In the context of a Web Service a Task acts as an operation and can accept incoming parameters.
Please see the Incoming Web Service Requests Tutorial for a step-by-step guide to using this feature.
Outgoing SOAP Requests from Presence
Presence can also call Web Services on other computers via Web Services Nodes.