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Early instant messaging programs were primarily real-time text, where characters appeared as they were typed. Modern implementations of real-time text also exist in instant messengers, such as AOL's Real-Time IM In the latter half of the 1980s and into the early 1990s, the Quantum Link online service for Commodore 64 computers offered user-to-user messages between concurrently connected customers, which they called "On-Line Messages" (or OLM for short), and later "Flash Mail." (Quantum Link later became America Online and made AOL Instant Messenger (AIM, discussed later).