“At the 1999 World Wide Developer’s Conference, Apple released
OpenPlay, the third project available under the Apple Public Source
License. OpenPlay is a toolkit which greatly simplifies the task of
building multiplayer games…”
“OpenPlay is a network abstraction layer for Mac OS and Windows
designed to simplify the task of creating programs which
communicate across multiple computers. While originally designed
for multiplayer games, it is useful for any developer who wants an
easy, platform-independent way to send messages to programs running
on other machines.”