The important parts are highlighted in red.  The first important item is the [[varbind]] that the request needs to process.  The second is a link to any other requests that are all being handed to the module's code.  It's very possible that one module may need to respond to multiple requests, and the agent bundles them all together in a linked list (although there are helpers that can split the list up for you if you'd prefer).

The important parts are highlighted in red.  The first important item is the [[varbind]] that the request needs to process.  The second is a link to any other requests that are all being handed to the module's code.  It's very possible that one module may need to respond to multiple requests, and the agent bundles them all together in a linked list (although there are helpers that can split the list up for you if you'd prefer).