A flat fee, also referred to as a flat rate or a linear rate, refers to a pricing structure that charges a single fixed fee for a service, regardless of usage.[1] Less commonly, the term may refer to a rate that does not vary with usage or time of use.
Synchronous: interrupt occurs as a result of current process, otherwise asynchronous. User requested: interrupt occurs because of direct result by user task, otherwise coerced. Maskable: if desired the interrupt can be disabled by a user task, otherwise unmasked.
Direct Market Access - DMA. What is 'Direct Market Access - DMA'. This refers to electronic facilities, often supplied by independent firms, that allow buy side firms to access liquidity for securities they may wish to buy or sell. Buy side firms are customers of sell side firms - brokerages and banks which may act as market makers in a security.