Instant messaging and presence information protocol
OSCAR (Open System for CommunicAtion in Realtime) is AOL's proprietary instant messaging and presence information protocol. It was used by AOL's AIM instant messaging system and ICQ.
Despite its name, the specifications for the protocol remain proprietary. AOL has gone to great lengths to keep competitors (namely Microsoft, XMPP, and Cerulean Studios) from implementing compatible clients for their proprietary messaging systems.[1][2] In 2002, AOL signed a contract with Apple, Inc., allowing them to use OSCAR (as well as AOL's own code libraries) in their iChat application. This allowed iChat users to interact with ICQ and AIM users directly. The deal also permitted users of Apple's .Mac service to log in to the AIM network using their .Mac email addresses. (This has carried over to Apple's MobileMe service.)
As of 2009[update], large parts of the protocol had been reverse-engineered and implemented by a number of third-party clients.
The OSCAR protocol can be used separately from AOL's network. In fact, AOL expands on the general concept of OSCAR, adding systems for service-side buddy lists and icons, as well as features for file transfers using Bonjour.
On March 6, 2006, AOL released the AIM SDK and launched a developer website, allowing developers to build plugins for AIM Triton, and build their own custom clients, which connect over the OSCAR protocol. They had not, at that point, however, released any information about the protocol itself.
On March 5, 2008, AOL released portions of the OSCAR protocol documentation. Google also provided the ability to sign in to AIM network via the Google Talk client built into Gmail.
^"AOL blocks Trillian IM access • The Register". The Register.
^"AOL vs. Trillian continues | News | Geek.com". Archived from the original on 2016-09-18. Retrieved 2018-02-05.
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