ProxyForward is an HSL modifier that is placed before the method keyword on a method signature. It marks the method as one that is to be executed on the originating node when called on a proxied node.
For uses such as Seamless world, nodes have a temporary copy, or proxy, replicated in other area server processes. The proxied node is a copy of the "source" node, which is the real node that is being replicated.
When a proxied node is established, the only methods that can be run on it are those which have the proxyLocal or proxyForward modifiers. Attempts to run any other method from the destination process, will generate a script error.
The ProxyForward modifier on a method, means that it will be run by the source process where the original node exists, instead of being run on the destination process where the proxied node exists.