HSLINK
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HS/LINK is a file transfer protocol developed by Samuel H. Smith in 1991-1992. HS/Link is a high speed, full streaming, bidirectional, batch file transfer protocol with advanced Full-Streaming-Error-Correction. Each side of the link is allowed to provide a list of files to be sent. Files will be sent in BOTH directions until both sides of the link are satisfied.
HS/Link is not just another bidirectional protocol, it is also a very fast protocol for normal downloading and uploading, incorporating some new ideas (such as Full-Streaming-Error-Correction and Dynamic-Code- Substitution) to make things happen a bit faster and with greater reliability.
HS/Link operates at or very near peak efficiency, often reaching 98% or more with pre-compressed files and non-buffered modems. Even higher speeds are possible with buffered or error correcting modems. A number of features, such as fast 32bit CRC protection, Full- Streaming-Error-Recovery and Dynamic-Code-Substitution, combine to give maximum performance and security.
HS/Link can resume an aborted transfer, verifying all existing data blocks to insure the resumed file completely matches the file being transmitted. This function can also update a file that has only a small number of changed, added, or deleted blocks.
