The Yahoo! Messenger Protocol (YMSG) is the underlying network protocol used by the Yahoo! Messenger instant messaging client. Yahoo! Instant Messager supports many features beyond just messaging, including off-line messaging, file transfer, chat, conferencing, voice chat, webcams and avatars.
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“She speaks!
O, speak again, bright angel, for thou art
As glorious to this night, being o’er my head,
As is a wingèd messenger of heaven ...”
—William Shakespeare (1564–1616)