IO Connect FDC3 is a JavaScript implementation of the FDC3 standard for IO Connect Browser and IO Connect Desktop.
The mission of FDC3 is to develop specific protocols and classifications to advance the ability of desktop applications in financial workflows to interoperate in a plug-and-play fashion without prior bilateral agreements.
You can find the FDC3 specification here.
You can find more information on the IO Connect FDC3 library here.