Assertion: interrupt's priority | /r/HasProperty | entered on conclusion
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text: Once started, an S.E.R. is always allowed to continue if it can; a high priority S.E.R. does not "interrupt" a low priority S.E.R. but is entered only on conclusion or halting of the current S.E.R. The co-ordinator has the role of the program equivalent of the "inhibit interrupt flip-flop", the lists of activated S.E.R.'s being the equivalent of the setting of several interrupt flip-flops.