What is Action Message Format?
AMF is a proprietary protocol developed by Macromedia for binary
data representation, based loosely on SOAP. AMF is used with
ByteArrays, The IExternalizable Interface, NetConnections,
NetStreams, and LocalConnections.
In plain english, AMF is a way of representing data in a binary
format in preperation for transfer from an application residing on
the client to an interpreter residing on the server. AMF has been
reverse engineered by the open source community, allowing for amf
interpreters such as amfphp (php), weborn (.net among others), and
blaze DS (java).