MacTCP

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MacTCP was the standard TCP/IP implementation for the Macintosh operating system through version 7.5.1. It is considered obsolete and has reliability issues and incomplete features that sometimes prevent it from operating properly on the modern Internet; Apple replaced it in 1995 with Open Transport. In addition, the API was unique to the Mac OS, and at least one developer released a Berkeley Sockets-derived API to make porting from other platforms easier.

It was originally a separate purchase from the Mac OS and was not included until later editions of System 7.