The U-interpreter (U = unraveling)
Each token consists of an activity name and data
- the activity name comprises the tag.
the tag has
- an instruction address n,
- the context field c that uniquely identifies the context in which the instruction is to be invoked,
- and the initiation number i that identifies the loop iteration in which this activity occurs.
Note, that c is itself an activity name.
Since the destination instruction may require more than one input, each token also carries the number of its destination port p.