WPmpg.com functions including XML-RPC interface.
Functionality enabling WPmpg.com services, including enhanced XML-RPC features.
According to Wikipedia, XML-RPC is a remote procedure call (RPC) protocol which uses XML to encode its calls and HTTP as a transport mechanism. Refer to the WordPress Wiki for further explanation about WordPress’ XML-RPC capabilities.
The remote publishing functionality is required to for this plugin to function. Make sure XML-RPC is enabled (step 3 in Installation).