User authentication method, must be called initially.

Submit one or more documents to the node.

Check the status of a transaction

Notify document availability, network events, submission statuses

Download one or more documents from the node

Execute a database query

Solicit a lengthy database operation.

Request the node to invoke a specified web services.

Check the status of the service

Query services offered by the node

Network Node 2.0 definitions for the Environmental Information Exchange Network