The optional argument Count is the number of loop messages to be
    sent to the loop mirror.  The test is complete when this number of
    loop messages has been reflected back by the loop mirror.  The
    default is 1, the value must be 0-4294967295.

    loop [node node-id] loopback application name full-name, -
         count integer [,optional arguments...]

    loop [node node-id] loopback application address tower-set, -
         count integer [,optional arguments...]

    Example:

    loop loopback application name DEC:.SCH.LAMCHP, count 10