A little like this perhaps? http://img141.images.../4396/cpdlc.jpg (top left windows)My implementation of CPDLC and ADS-C in the next version of my plugin for EuroScope (a VATSIM ATC Client). Based on hoppies ACARS network - http://www.hoppie.nl/acars/Hoppie also has his own standalone CPDLC client that controllers can use, and the network is growing in popularity / use by the VATSIM community. I would love some form of implementation (even if PMDG "just" made an SDK so someone else could program it into the CDU) into FS. Presently pilots have to run a number of external applications to use this, as it was originally designed for PS1 and then adapted to MSFS.