The software necessary for receiving COMEX messages is available at the following link: http://w3jjj.com/downloads/M110ATESTB9C8_FI.zip Installation instructions are included with the download.

N2CKH has provided excellent information regarding MS-DMT at http://www.n2ckh.com/MARS_ALE_FORUM/MSDMT.html There is a sample audio file on this page which can be used to test equipment.