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Traditionally, a device has an interrupt line (pin) which it asserts when it wants to signal an interrupt to the host processing environment. This traditional form of interrupt signalling is an out-of-band form of control signalling since it uses a dedicated path to send such control information, separately from the main data path.
Using PC streaming, a similar structure to the one used today allowed the listener to play songs freely, but with ads every 4–7 songs depending on listening duration. Later that same year, in March, Spotify removed all limits on the free service tier indefinitely, including mobile devices.