1. A method, comprising: managing user-level threads on a first instruction sequencer in response to executing user-level instructions on a second instruction sequencer that is under control of an application level program; and running a first user-level thread that contains one or more user-level instructions on the second instruction sequencer, wherein a first user level instruction has at least one of 1) a field that makes reference to one or more instruction sequencers and 2) implicitly references with a pointer to code that specifically addresses one or more instruction sequencers when the code is executed.