It's hard to find Fidonet stuff with Google. http://ftsc.org/docs/fts-0009.001
It seems fairly straight forward, just need to find a way to dump a sequential hex number to a data file and add it to the queue of mashing that goes on now.
Just start at 000001 and keep on going from there. No idea how to manage that from a batch file as yet. Probably easier to store the number as a decimal and
then push a hex conversion into the message. What the number is won't matter locally, as it'll have no idea about them, and so long as they keep increasing outside all will be well.
Spec
*** THE READER V4.50 [freeware]
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* Origin: Scrawled in haste at The Lower Planes (21:3/101)