ISA enterprise and arrays

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Just want to check that I've got this correct:

an ISA enterprise comprises any of these computers:

Configuration Storage server(s)
Computers with ISA Server service installed
Computers with ISA Server Management console installed
Computers with ISA Server-related components installed e.g. Message Screener

whereas

an ISA array consists of:

Computers with ISA Server service installed

Is my summation correct?