Running FLdigi and MARS-M110A MDT on Flex 5000a.Yes, you will have to set up two separate "virtual cables" in order to run FLdigi and MARS-M110A MDT on Flex 5000a because these are two distinct products. However, in order to connect the device to your computer, you will need only a single cable. I recommend you contact the Flex 5000a's manufacturer for further details. You can get in touch with them using the contact details from the official web page.
The MIL-STD Data Modem Terminal (MS-DMT) is a modem-based communications terminal tool developed as a Microsoft Foundation Class (MFC) Multithreading 32-bit application designed to run under MS-Windows XP SP3 and, thus, also Vista SP2, Windows 7 and Windows 8 operating systems.