Hallvard:

> How does one tell the number of a messages in the rebol.org archive?

Here's three ways you can use:

[use the number format]

If you know number, put it directly into the URL -- both of these get you the 
same message:

http://www.rebol.org/cgi-bin/cgiwrap/rebol/ml-display-message.r?m=rmlJGRC
http://www.rebol.org/cgi-bin/cgiwrap/rebol/ml-display-message.r?m=rml239999

The clues you need to make sense of this are:
* the m= parameter always starts "rml" as a ML identifier. Means
   we could support other Mailing lists in future;
* the first message number is 200'000. We started there so we'd have
  100'000 numbers reserved for whenever software archaeologists found
  us earlier messages than the archive's start date. (plus another 100'000
  reserved for other uses);
* the letter format is not case sensitive;
* we use the letter format publicly because that's more google-friendly.



[use Library Data Services]

do http://www.rebol.org/library/public/lds-local.r
probe lds/send-server 'get-rml-message ["jgrc"]

* the structure that comes back contains the msg-id as an integer



[reverse engineer the letters-to-integer algorithm]

The note in the source code says the algorithm is explicitly intended to give 
people some fun in trying to reverse engineer it. So look away now if you 
don't want to be handed the answer on a plate:
.
.
.
.
.
.
.
.
do 
http://www.rebol.org/cgi-bin/cgiwrap/rebol/download-a-script.r?script-name=base-convert.r
rml-base-letters: copy "NPRHDWVMTGBSKJQCFYLXZ"
msgid: copy "JGRC"

100000 + base-convert/from-base head reverse copy msgid  rml-base-letters
== 239999

head reverse base-convert/to-base (239999 - 100000)  rml-base-letters
== "JGRC"

Sunanda
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