THE ZMODEM PROTOCOL

 This advanced protocol is very fast and incredibly
 reliable, and offers many features. Zmodem can transfer a
 group of files in one batch, and keeps the exact file sizes
 and dates. Zmodem can detect and recover from errors quickly,
 and can resume an interrupted transfer at a later time (this
 feature, called Crash Recovery, may be toggled in the
 'Protocol options' page of the Configuration Menu). Zmodem is
 also very well suited for satellite links and packet switched
 networks.