A system and method for ensuring the execution of commands is visible throughout that system. A flush command is received and enqueued in a first queue together with a synchronization value enqueued in a second queue. The flush command is delayed from being dequeued from the first queue until both the...http://www.google.de/patents/US5990913?utm_source=gb-gplus-sharePatent US5990913 - Method and apparatus for implementing a flush command for an accelerated graphics port device