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While I'm now successfully reading, updating, and writing datalink fields
from MI, I'm a bit curious about some of the subfields in the datalink
header. Obviously, the first two bytes are the overall length, like any
other VARLEN field, and the URL length is 5 bytes of zoned decimal
starting at byte 12, and the link type ("URL") immediately preceeds that,
but what about the "00001" before the link type? What about the 8 nulls
after the URL length?


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