HISTORY
-------

2.04: modification of cb's usage info so that it displays a minimal usage info
    even if the callback.setup file isn't available.

2.03: Defining the callback.setup entry 'diallogfile:', logging the
    times, targetnames and phonenumbers that are called back.
     
2.02a: distribution update: no software changes, but a typo in the provided
    callback.setup file was repaired: with de 'frank' userspecification the
    group 'its-me' must be (and is now) changed to 'sm'.

2.02: The display of the 'extra', 'direct' and normal callback destinations
    can be controlled from the callback.setup file. By default the 'extra' and
    'direct' entries are not displayed in the lists cblogin presents. The 'cb
    list' command always displays all entries. In the callback.setup defaults
    section, the keywords
        extra
        direct
    and
        nodestinations
    can be used to control, respectively, the display of 'extra' and 'direct'
    destinations, and the suppression of the display of the 'normal'
    destinations.

2.01: CHANGELOG file reorganized,
    technical.info file added,
    bug in the rss:combine() file repaired.

2.00: Reorganizing the callback system: callback.setup introduced to configure
    the callback system run-time for the dial-in or callback modes. Support
    for multiple modem lines. The callback package maintained by Frank B.
    Brokken (frank@icce.rug.nl). 

1.21: Another code rewrite. "extra" and "direct" are no longer controlled by
    defines in config.h but are used when defined in
    /conf/callback/callback.ph. Password-like validation for these entries
    added.

1.20: Major code rewrite. Multiple definition files for callback connections
    supported. Added "direct" option. Docs improved. cbgetty program added.
      
1.11: Again a minor update. I'm not even sure that I will upload this version
    to tsx-11 and sunsite.

1.10: Minor update. Program cbstat now goes into /sbin; cblogin still goes
    into /conf/callback. The Icmake binaries were added to the distribution.

1.09: Code cleanup, usage information improved.

1.08: cbstat slightly changed: -reset no longer restarts init; only -wake
    does.

1.07: Incomplete version, used old documentation and contained no binary
    distribution. Discarded.

1.06: GETTYSTRING (see src/config.h) changed into "getty", no more 
    "/etc/getty ttyS3 modem vt100". I only have getty processes watching
    the modem, no other.
    Documentation updated.. again.
      
1.05: reinit() function of src/rss, used in both cbstat and cblogin, now 
    sends a SIGHUP to all appropriate (uu)getty processes. Defines 
    PSCMD and GETTYSTRING added to config.h.
    My compilation results now also distributed in bin/.

1.04: Flags of cbstat may be abbreviated; cbstat -f is equivalent to cbstat 
    -fi, or cbstat -fil or -file.
      
1.03: cbstat -disable added, DISABLEGETTY define in config.h reflects the
    used file.
    Extra phone number to callback added, cbstat -callextra implemented.
    Documentation revised.

1.02: Usage of cbstat changed. Can now dump current (uu)getty definitions
    file.. I think it's handy.

1.01: State logging changed. The contents of the statefile are '0' for
    state 0, '1' for state 1, etc. Previously that was '\x00' for state 0,
    '\x01' for state 1, etc.
    Callback login program renamed to cblogin.
    Code split into directories, src/rss contains runtime support system,
    src/cblogin contains cblogin program etc.
    New program cbstat.
      
1.00: Initial release. One program, callback, as a bogus login.

