Photoshop Scripting Documentation
Photoshop Kevlar API
Photoshop (Network Sender)
Photoshop (Network Receiver)
AsRaw (EX9.Texture Photoshop)
...and many more
vvvv can talk to Photoshop running on any networked machine. Images can be sent to and requested from Photoshop.
The convenient Photoshop (EX9.Texture) automatically pulls an image from Photoshop when any change was made to a document.
Nodes in this category are coming with the addonpack.
Examples in your vvvv\addonpack\girlpower\ directory: