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1997-12-16
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MUSIC Kermit 4.3.x "Beware File" - Known Bugs, Problems, Limitations.
As of: 14:25 Friday, 1997 Jun 13
This file contains (A) instructions for applying Kermit updates, (B) a
list of unresolved problems, (C) a list of problems with work-arounds or
optional fixes, and (D) a list of resolved problems.
NOTE: entries will sometimes be entered under (D) even though the needed
updates have not been released in IKMKER.UPD. Please check the date of
the UPD and NUP files to see if they have been changed before requesting
new copies.
Bug reports may be sent to John Chandler <JCHBN@CUVMB.CC.COLUMBIA.EDU>.
Kermit-370 carries an "edit" number in addition to the version and
release numbers. The three numbers together are printed out in the
assembly listing and displayed by Kermit at startup time. Be sure to
include all three numbers (e.g., 4.3.0) along with any error reports.
A) Update instructions .................................................
Many updates have been received since Kermit-370 4.2 was released. All
updates prior to 93/9/30 have been removed from IKMKER.UPD and applied
to the sources in the process of creating 4.3. If your source does not
include the line defining &KVRSN to be 4.3, you should obtain an all-new
source distribution from Columbia. Any updates created later than your
source should be applied before you make the executable module. In
general, updates received at Columbia will not be included in the source
files in the MUSIC Kermit distribution until and unless "major" bugs are
uncovered, and then all accumulated updates will be applied at once.
The description of each problem and a pointer to its solution will
always be included in IKMKER.BWR (the present file), but the updates
themselves are to be found in IKMKER.UPD.
The procedure to update your copy of MUSIC Kermit is as follows:
1) Obtain the latest version of IKMKER.UPD, which contains all the
updates, each preceded by a separator beginning "./ * :READ" and
giving the update's name. Please note that some modes of file
transport have a side effect of either doubling or removing any
periods in the first column -- if your copy of IKMKER.UPD has
records beginning with "/", then all instances of "/" in column 1
should be changed to "./". Similarly, any instances of ".." in
columns 1-2 should be changed to just ".". A related problem can
affect the sources by leaving a blank in column 80. That can happen
via the loss of a "." in column 1 (in which case the sequence number
will be shifted into columns 72-79) or via automated efforts to
preserve the "." (in which case the sequence number will be
truncated). The repair consists of inserting the missing "." in
column 1 or "0" in column 80. If you are installing a beta-test
Kermit, you also need the latest IKMKER.NUP, which contains all the
new updates. Any local or optional updates must be gathered in a
file called KERMIT.LOCAL.
2) Determine the date of your sources. If you received them from a
secondary supplier, you will need to examine the source code to
determine the most recent update applied. Just sort the combined
source by columns 67-71: the last line will be labelled with the
last-applied update. Although the current official sources for the
generic and MUSIC-specific parts of Kermit were released at the
same time, it may be necessary in the future to determine the dates
separately for the two types of source code (IKM*.ASM vs. IK0*.ASM).
3) If your sources predate all the updates in IKMKER.UPD, i.e., if they
are "pure" Columbia 4.3, go on to step 4. Otherwise, go through the
list of updates at the beginning of IKMKER.UPD and note which ones
are already included in (i.e., are older than) your sources. MUSIC-
specific ones are marked as such, in case your generic and MUSIC
parts have different dates. Disable each such redundant update by
deleting the update from the update file.
4) Use the procedure IKMINS from the installation guide to install
Kermit.
------------------------------------------------------------------------
B) Unresolved problems .................................................
---------------- 89/1/15 -----------------------------------------------
MUSIC-Kermit cannot execute arbitrary host commands.
---------------- 89/1/20 -----------------------------------------------
Now that Kermit-370 supports multiple-filespec SEND, it is possible for
a single SEND subcommand to specify overlapping wildcard filespecs.
Only the CMS variant keeps track and makes sure that it doesn't send the
same file twice within one send invocation. The others, including MUSIC
Kermit-370, may send the same file again, and it is left to the user to
prevent filename-collision problems on the receiving end.
---------------- 90/5/8 ------------------------------------------------
With a few exceptions, CONTROLLER will be set automatically when Kermit
is invoked. See file IK0AAA.HLP in the Kermit distribution for a list
of front ends that have been reported to allow Kermit file transfers
and another list of reported failures.
---------------- 93/8/24 -----------------------------------------------
There appears to be a bug in MUSIC 2.4, either in the assembler or in
the macro library, such that it cannot assemble the current release of
Kermit (and presumably other programs as well). MUSIC 3.1 seems ok.
------------------------------------------------------------------------
C) Problems with workarounds or optional fixes .........................
---------------- 89/2/27 -----------------------------------------------
The code for detecting the difference between SERIES1- and GRAPHICS-type
terminal controllers may cause peculiar error messages at session
startup, particularly if you try to run Kermit on an IBM 3270-type
terminal. For example, you might see a PROG470 or PROG729 error.
Normally, Kermit can recover from these error conditions, but some
configurations and/or versions of VTAM may hang the terminal session
instead. If you cannot get Kermit-MUSIC to start up successfully, you
might want to bypass the code (especially if you don't have any
GRAPHICS-type terminals). The code is governed by a set of switches
which can be tailored to your needs:
STCQBIT EQU X'01' WSF Query is always allowed
STCQNS1 EQU X'02' WSF Q implies *not* SERIES1
STCS1 EQU X'04' Always assume SERIES1
STCNOS1 EQU X'08' Always assume *not* SERIES1
STCNORD EQU X'10' Asynch READ MOD is forbidden
Since there is apparently no way for a program running under MUSIC to
determine whether a WSF Query is allowed, Kermit-MUSIC must assume that
it is. Therefore, the standard flag value is STCQBIT; if you wish to
force the code to select SERIES1, you should change that to STCS1, as in
the following:
./ * SC9131X - Customize controller type selection
./ R 01151200 $ 1151200 100 11/21/91 00:16:50
&CONOPTS SETC 'STCS1' SETCON options @SC9131X
Alternatively, if you have *only* GRAPHICS-type controllers, you could
change it to STCNOS1 (or STCNOS1+STCQBIT if you also have 3174 AEA
controllers).
Note: prior to version 4.2.2 of Kermit-MUSIC, the SERIES1 option was
"wired" in for all fullscreen sessions. See the entry of 91/8/19 in
part D for further notes.
---------------- 90/7/5 ------------------------------------------------
Kermit-370 now honors the file type specification (binary or text) given
by a sending Kermit in an Attribute packet. Old procedures for sending
binary files may therefore not work properly anymore. To return to the
old mode of operation, issue the subcommand SET ATTR TYPE OFF. To live
with the new mode, be sure to issue the SET FILE TYPE to both sending
and receiving Kermits (to be safe).
---------------- 90/7/30 -----------------------------------------------
When the file type is TEXT and the recfm is F, Kermit-370 strips off
trailing blanks from each record before sending a file. In order to
keep trailing blanks in a downloaded file, you can convert it to RECFM
V before sending it.
---------------- 90/8/22 -----------------------------------------------
If, for some reason, the other Kermit insists on pretending ASCII bytes
all have the 8th bit set, Kermit-370 will not detect the intended CRLF
separators between lines. The result of uploading from such a Kermit is
a (text) file with only one record. If the other Kermit cannot be
fixed, the following update will make Kermit-370 treat ASCII 8D and 8A
the same as 0D and 0A, as long as the ATOE table does so.
./ * SC90151 - Forgive 7-bit ASCII files with 8th bit on
./ I 02490500 $ 2490700 200 08/03/90 16:06:46
ISW78 DC X'7F' Start with 7-bit ASCII @SC90151
./ I 02713500 $ 2713700 200 08/03/90 16:06:46
SW78 DS X'7F' Switch for 7-bit/8-bit ASCII @SC90151
./ I 03347500 $ 3347700 200 08/03/90 ->4.3<-
KCALL TBLCRLF Note current treatment @SC90151
./ I 03350500 $ 3350700 200 08/03/90 ->4.3<-
KCALL TBLCRLF Note current treatment @SC90151
./ I 04016000 $ 4016200 200 08/03/90 ->4.3<-
KCALL TBLCRLF Reset 7-bit/8-bit mask for CRLF @SC90151
./ I 04063000 $ 4063040 40 08/03/90 ->4.3<-
*
* Entry: nothing special @SC90151
* Exit: SW78 set up correctly @SC90151
TBLCRLF ENTER ALT @SC90151
MVI SW78,255 Assume 8-bit codes @SC90151
CLC ATOE+ALF(1),ATOE+ALF+128 @SC90151
BNE RTRN0 @SC90151
CLC ATOE+CR(1),ATOE+CR+128 @SC90151
BNE RTRN0 @SC90151
MVI SW78,127 No, 7-bit codes @SC90151
B RTRN0 @SC90151
./ I 08391000 $ 8391200 200 08/03/90 ->4.3<-
NC CUR,SW78 If 7-bit ASCII, ignore 8th bit @SC90151
---------------- 91/11/21 ----------------------------------------------
In order to change the default Kanji encoding from IBM-style to another,
add one of the following updates.
./ * SC9132X - Change Kanji default
./ R 01416000 $ 1416000 10 11/21/91 ->4.3<-
&KNJDEF SETC 'HITACHI' Default Kanji @SC9132X
./ * SC9132X - Change Kanji default
./ R 01416000 $ 1416000 10 11/21/91 ->4.3<-
&KNJDEF SETC 'FUJITSU' Default Kanji @SC9132X
---------------- 92/4/10 -----------------------------------------------
The minimum size of strings to be subjected to run-length encoding may
need to be changed to two to make the new FULLSCREEN mode work on
certain protocol converters, such as the MICOM 7400, which convert three
successive blanks into cursor motion commands (or even two!). The
following update accomplishes that.
./ * SC92101 - Encode multiple blanks
./ I 08296500 $ 8296550 50 04/10/92 ->4.3<-
CLI 0(8),ABL Is it a blank? @SC92101
BNE ENCRP1 No, use normal criterion @SC92101
C 14,F2 @SC92101
BNL ENCRP2 Always encode multiple blanks @SC92101
ENCRP1 DS 0H @SC92101
./ I 08297500 $ 8297700 200 04/10/92 ->4.3<-
ENCRP2 DS 0H @SC92101
---------------- 92/4/6 ------------------------------------------------
The time of day associated with a disk file was introduced in MUSIC/SP
in version 2.1. For prior releases, the following update is needed to
avoid undefined symbols. See also the note below dated 94/9/21 with
update SC94263.
./ * SC92127 - Compatibility with pre-2.1 MUSIC
./ D 01034500
./ R 01044500 $ 1044500 200
MFXIDT DS AL4 Dummy time of day (pre-2.1 MUSIC) @SC92127
./ D 05423500
---------------- 92/10/18 ----------------------------------------------
When Kanji characters are first selected, the default for the single-
byte character set is CP290 (hard-coded in Kermit-370). That can be
changed, however:
./ * SC92252 - Make CP281 the default SBCS with KANJI
./ R 04118000 $ 4118000 100 10/18/91 ->4.3<-
TBVJP DC CL(LALF)'CP281',CL(LALF)'CP500',CL(LALF)'CP290' @SC92252
---------------- 94/9/21 -----------------------------------------------
The new long userids were introduced in MUSIC/SP in version 2.4, and
part of Kermit's support for the longer file names is incompatible with
MUSIC 2.3. However, it is possible to retro-fit to version 2.3 with the
following update. See also the note above dated 92/4/6 with update
SC92127.
./ * SC94263 - Retrofit for MUSIC 2.3 (MUSIC)
./ R 00997000 $ 997000 300 09/21/94 15:53:29
LFCODE EQU 4 @SC94263
./ R 01033000 $ 1033000 500 08/26/93 13:03:01
MFARG XNAME=0,INFIN=0,INFOUT=0,ARG=0 @SC94263
./ D 01038500 08/26/93 13:03:01
./ I 01177000 $ 1177300 300 09/22/94 15:24:42
$USERID EQU $USRCDE Use old location @SC94263
$OWNL EQU F4+3 Length is always 4 @SC94263
./ R 05422000 $ 5422000 500 08/27/93 12:44:16
MFARG XNAME=MFNAME,INFIN=ZINFIN @SC94263
./ R 06317400 06317500 $ 6317400 100 09/22/94 09:44:47
LA 0,MFUIFC Code for file (blank padded) @SC94263
LA 1,4 Length of field @SC94263
---------------- 94/10/20 ----------------------------------------------
The DIR and TYPE subcommands, as well as and the emulated MUSIC LIST,
LIBRARY, COPY, PURGE, and RENAME commands, do not permit backwards-
relative target names, i.e., those using ".." as a directory component,
even though Kermit does permit such names in the CWD subcommand and the
emulated MUSIC CD command.
---------------- 94/12/20 ----------------------------------------------
The GUPI command, used for installing Kermit, can also be used for
applying updates to other software. Version 1.3, as distributed with
Kermit, however, does not include support for long user ids or file
names (see the note under D below dated 93/8/25). The following update
may be used to add that support, thereby creating GUPI 1.3X. If this
update is stored in the Kermit directory as IKMGUP.UPD when Kermit is
installed, and if there is no GUPI executable (called GUPI.LMOD), the
normal installation procedure will bootstrap GUPI to level 1.3X.
./ * GUPI - SC93236 - Support long userid's and file names (MUSIC)
./ R 00917000 $ 917000 500 08/26/93 13:03:01
LH 9,DESTL Length of string @SC93236
./ R 00997000 $ 997000 300 08/24/93 16:50:09
LFCODE EQU 16 @SC93236
LFID EQU 64 Max length of filespec @SC93236
FABFN DS CL(LFID) MUSIC filename & code @SC93236
./ R 01025000 01027000 $ 1025000 1000 08/24/93 16:50:09
UCODE DS CL(LFID) User code @SC93236
SCODE DS CL20 SEARCH CODE @SC93236
FCODE DS CL16 CODE LOCATED BY MFINDX @SC93236
./ R 01033000 $ 1033000 500 08/26/93 13:03:01
MFARG XNAME=0,INFIN=0,INFOUT=0,ARG=0 @SC93236
./ R 01038000 $ 1038000 500 08/26/93 13:03:01
MFNAME MFVAR XNAME,PRE=MF,PICT=Y @SC93236
./ R 01057000 $ 1057000 500 08/27/93 12:44:16
DESTL DS H Non-zero if CWD set. @SC93236
./ R 01059000 01060000 $ 1059000 1000 08/24/93 16:50:09
NXFN DS CL(LFID) Pattern filespec @SC93236
LCFN DS CL(LFID) Located filename @SC93236
./ I 01066000 $ 1066500 500 10/07/94 23:49:07
NXFNWL DS H Length of string to last wildcard @SC93236
./ D 01100000 01101000 09/01/93 16:15:53
./ D 01111000 08/24/93 16:50:09
./ R 01148090 $ 1148090 10 10/12/94 13:31:34
&CWDERRM SETC 'Must be a valid MUSIC path name' @SC93236
./ D 01157000 08/24/93 16:50:09
./ D 10014000 10/14/94 17:28:11
./ R 10039000 $ 10039000 500 10/14/94 18:15:27
WTEXT 'MUSIC-GUPI Version 1.3X' @SC93236
./ R 10058000 $ 10058000 500 10/14/94 18:33:13
PTEXT 'Filename too long.',AREG=8,LREG=9 @SC93236
./ R 10063000 $ 10063000 500 10/14/94 18:33:13
CH 1,=Y(LFID-1) Maximum name length... @SC93236
./ R 10126000 $ 10126000 500 10/14/94 17:28:11
DSKERR LA 2,FABFN-FABD(,1) @SC93236
./ R 10305000 $ 10305000 500 08/27/93 12:44:16
MFARG XNAME=MFNAME,INFIN=ZINFIN @SC93236
MFARG INFOUT=ZINFOUT,ARG=ZARG @SC93236
./ R 10309000 $ 10309000 500 10/14/94 17:28:11
MFNAME MFVAR XNAME,PRE=MF @SC93236
./ R 10316000 $ 10316000 500 10/14/94 17:28:11
ZINFDEF DC F'256',F'-100',F'-1',H'80',X'0400',X'0000C0C0' @SC93236
------------------------------------------------------------------------
D) Resolved problems ...................................................
---------------- 90/5/8 ------------------------------------------------
A commonly reported "problem" is that Kermit-MUSIC objects to a send
packet size greater than 94, and users wonder how to turn on long-packet
protocol for downloads. The answer is that the the maximum packet size
in Kermit protocol is always dictated by the receiving Kermit -- ALWAYS.
NOTHING YOU CAN SAY TO A SENDING KERMIT WILL EVER MAKE IT SEND PACKETS
LONGER THAN THE RECEIVING KERMIT ASKS FOR. Conversely, Kermit-MUSIC will
always use packets as long as possible unless frequent transmission
errors indicate a noisy communication line. The only purpose for the
send packet-size parameter in Kermit-MUSIC is to set the default, in case
the receiving Kermit is badly crippled (in which case, long packets are
entirely out of the question anyway), or to control "raw" downloads
(those without Kermit protocol and parameter negotiation).
---------------- 90/6/22 -----------------------------------------------
Kermit-370 supports file transfers through the IBM 3174 AEA with B2 or
higher configuration. The support is restricted to terminal types
defined in the 3174 to have ASCII Graphics capability. That capability
is available by default only for VT241 and Tektronix 4205 terminals, but
user-defined terminal types are also possible. Also, the Graphics
capability is allowed only for lines defined without associated Host
Addressible Printers. Kermit-370 now automatically detects the B2 AEA
and sets CONTROLLER accordingly (to AEA if Graphics is allowed, to NONE
if not). However, if the 3174 is owned by VTAM, and the connection is
made with a logmode that forbids the Read Partition Query (such as
M2SDLCNQ), Kermit cannot detect the AEA and will default to CONTROLLER
GRAPHICS (and, incidentally, cannot transfer files even with CONTROLLER
set to AEA by hand). M2SDLCQ is known to allow correct operation, but
other logmodes have not been tested. Since the 3174 supports full 8-bit
communication, it may be useful to configure the ports for 8-bit data
and to set both SEND and RECEIVE PARITY to NONE in Kermit-370. The fix:
SC90173.
---------------- 93/8/25 -----------------------------------------------
Kermit-MUSIC now supports file directories (which appeared in MUSIC 2.3)
and userids longer than four bytes (which appeared in MUSIC 2.4). This
results in a number of related changes in Kermit operation: [1] Kermit
starts up in the current directory (and echoes the path name briefly
before displaying the normal greetings), [2] Kermit now displays the new
path name whenever it executes a successful CWD, [3] the MUSIC CD
command is emulated by Kermit, and [4] the DIR subcommand (like the
emulated MUSIC LIBRARY command) recognizes subdirectories much as the
LIBRARY command in MUSIC. Note: when Kermit quits, it leaves the user
in the then-current directory. The fix: SC93236 in IKMKER.UPD.
---------------- 94/3/15 -----------------------------------------------
Kermit-370 now sends an explicit NAK packet when it receives a bad data
packet, instead of resending the previous ACK (which is nominally the
same thing in Kermit protocol). This way, there are no needless
timeouts when dealing with a zealous sliding-windows Kermit. The fix:
SC94074 in IKMKER.UPD.
---------------- 94/6/23 -----------------------------------------------
Kermit-370 honors a new protocol feature known as "WHATAMI". Thus, when
Kermit-370 is in server mode, the user can issue a SET FILE TYPE to the
local Kermit and have it take effect in the server as well. The local
Kermit obviously must also support WHATAMI. The fix: SC94174 in
IKMKER.UPD. See also the note in section (C) dated 90/7/5.
---------------- 94/6/30 -----------------------------------------------
Kermit-370 honors the new level-1 restart/recovery mode. When a
similarly equipped Kermit is at the other end, an interrupted binary
transfer can be resumed where it left off by issuing a RESEND instead of
a SEND (same syntax). Attributes must be enabled at both ends of the
transfer, and the sender must be set to binary (V-BINARY and D-BINARY
are also acceptable). If the file in question is already fully received
at the other end, RESEND does nothing; if the file is not even partially
received, RESEND behaves just like SEND. In order to insure that the
partial file is not erased when a transfer aborts, it is helpful to
issue a SET INCOMPLETE KEEP to the receiving Kermit. Kermit-370 now
also supports the UPDATE option of FILE COLLISION. With that option, a
received file is rejected (on grounds of "date") if the transmitted time
stamp is no later than that of an existing file of the same name. The
fix: SC94181 in IKMKER.UPD.
---------------- 94/9/3 ------------------------------------------------
Kermit-370 gives more accurate transfer statistics after uploads in
server mode. Formerly, the time used in figuring transfer rates
included any waiting time after the transfer completed but before the
next inter-Kermit communication (result: understimated efficiency).
The fix: SC94245 in IKMKER.UPD.
---------------- 94/9/20 -----------------------------------------------
Kermit-MUSIC now has more addressible space for optional global code,
such as the TRACE facility (which is normally not enabled). The fix:
SC94262 in IKMKER.UPD.
---------------- 94/9/22 -----------------------------------------------
Kermit-MUSIC now passes any non-emulated MUSIC commands to the system
for execution. Such commands are executed in a sub-task, and any
non-zero completion code is reported. As always, Kermit treats any
invalid Kermit subcommand as a presumed MUSIC command if (and only if)
SYSCMD is set ON. There is a small fix to the DIR subcommand, such that
the default target is "*", and a related fix to all the emulated MUSIC
commands such that they no longer generate spurious "invalid command"
messages. The fix: SC94264 in IKMKER.UPD.
---------------- 94/10/15 ----------------------------------------------
Kermit-MUSIC now attempts to prevent losing exclusive control over the
screen during transfers by setting MESSAGE OFF (and restoring the old
setting afterwards). If control is lost anyway, Kermit attempts to
recover. Executing REMOTE HOST commands as a server can trigger such a
loss of control, but the recovery restores commumication. Recovery I/O
operations are marked "b" in the Kermit log, just as in Kermit-CMS. The
fix: SC94287 in IKMKER.UPD.
---------------- 94/10/27 ----------------------------------------------
Kermit-MUSIC now correctly executes the GIVE CONTROL subcommand (for
saving the current values of the CONTROL-CHAR table of prefixed and
unprefixed control characters). The fix: SC94299 in IKMKER.UPD.
---------------- 95/1/23 -----------------------------------------------
Kermit-370 misbehaved when doing a RESEND of a file that was already
entirely received on the target system. If the length matched exactly
that of the file to be sent, the whole thing would be sent again and
appended. That is now corrected. Also, Kermit-370 now has the APC
subcommand for sending Kermit commands to the micro while in connect
mode. The fix: SC95023 in IKMKER.UPD.
---------------- 95/2/1 ------------------------------------------------
Kermit-370 objected to receiving a RESEND of a file too large to fit on
disk without removing the portion already received. It now takes into
account the fact that that portion will not be duplicated.
The fix: SC95032 in IKMKER.UPD.
---------------- 95/2/2 ------------------------------------------------
Kermit-370 is now at level 4.3.1.
---------------- 95/2/28 -----------------------------------------------
Kermit-370 now uses the newly-transmitted time tag for a file that is
resumed after an abortive transfer. The fix: SC95059 in IKMKER.UPD.
---------------- 95/4/18 -----------------------------------------------
Kermit-370 no longer treats an error-free file transfer as an "error"
for the purpose of deciding whether to halt execution of a TAKE file.
The fix: SC95108 in IKMKER.UPD.
---------------- 95/6/23 -----------------------------------------------
Kermit-370 now supports the REGET subcommand, which works like GET, but
makes the server do a RESEND of the requested file. The fix: SC95174 in
IKMKER.UPD.
---------------- 96/5/1 ------------------------------------------------
Kermit-370 now suppresses the "doubled" transmission of a file that can
sometimes occur on a flaky connection. (This was a problem introduced
in the process of avoiding unnecessary time-outs on flaky lines.) The
fix: SC96122 in IKMKER.UPD.
---------------- 96/5/30 -----------------------------------------------
Kermit-370 now announces its system type to the other Kermit before a
transfer. This meshes with new versions of the various micro Kermits
that expect that information and will display it to the transfer screen.
The fix: SC96151 in IKMKER.UPD.
---------------- 96/6/6 ------------------------------------------------
Kermit-370 has been modified to take advantage of another recent upgrade
to micro Kermits -- it will be possible to issue a SEND or GET to the
mainframe Kermit, and the micro will automatically pop from terminal
emulation into transfer mode and then revert to emulation as soon as the
transfer is done. The fix: SC96158 in IKMKER.UPD.
---------------- 97/1/28 -----------------------------------------------
Kermit-370 was failing to clear the "Kermit command error" status upon
execution of the VERSION and ECHO subcommands. It now clears that
status condition to "No errors" after all subcommands, as described in
the documentation. The fix: SC97028 in IKMKER.UPD.
---------------- 97/6/13 -----------------------------------------------
Kermit-370 is now at level 4.3.2.
------------------------------------------------------------------------