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Unlike [[ZMODEM]] and other older protocols, SMODEM has a separate low-level multiplexed transfer layer (MSLP) and a high-level file transfer layer. This simplifies the protocol design and provides a very high efficiency of 99.5%. The multiplexing makes it possible to send one or more files in a continuous stream without any breaks between the files, boosting the throughput dramatically when transferring multiple files.
 
The multiplexing also made possible {{clarify|date=February 2013}} to add a full-screen ANSI terminal emulator with a local full-featured line editor and colored scroll-back buffer of 'unlimited' size. The locally buffered terminal emulation allowed users to chat during full-speed bidirectional file transfers.
 
The protocol is symmetrical and can connect with itself in [[loop-back]] mode. Files can be simultaneously transmitted and received without noticeable performance loss.