First of all, converting set number to file name may not be as difficult as it appears.  With a set number greater than 99, the last digit of the file name is the same as the last digit of the set number, and the first two digits are represented by a letter just as in hexadecimal notation (A=10, B=11, ...).  So Set number 112 in base XYZ would be XYZB2.  As you pointed out, you can get dataset information from MPEX using the file name.  You can also use the dataset name as follows:
LISTF [log in to unmask](DBSETNAME="ACCOUNT-MASTER"),DB

I realize this isn't exactly what you were looking for, but I hope it helps.


 ----------
From: Leonard_Berkowitz@HARVARDPILGR
To: [log in to unmask]
Subject: TurboImage: getting it all together
Date: Friday, August 11, 2000 11:13AM

<<File Attachment: ENVELOPE.TXT>>
There are at least three pieces of information about a dataset that are
useful
to have at one time:

     1. The MPE/iX file name
     2. The set number
     3. The dataset name

Very oten, one of these three is known and knowledge of the one or both
of the
the other two is required.

Starting with the dataset name, both Adager and Suprtool will provide the
set
number (from which I can infer the MPE/iX file name up to 99 and
calculate it
above 99, a bother.

Starting with the MPE/iX file name, MPEX LISTF filename,DB will return the
dataset name. Of course, starting with the set number I can infer or
calculate
the MPE/iX file name, another bother.

Is there any place where I can type one of the three aliases and have
returned
the other two? (a la CALC where I can use a hex, decimal or octal number
and
have returned the result in all three formats).

Thanks,
===================
Leonard S. Berkowitz
Perot Health Care Systems
(Harvard Pilgrim Health Care account)
voice: 617-509-1212
fax:   617-509-3737
pager: 781-226-2431