HISTORY
-------

1.00: Initial release. One program, callback, as a bogus login.

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

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.

1.04: Flags of cbstat may be abbreviated; cbstat -f is equivalent to cbstat 
      -fi, or cbstat -fil or -file.
      
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/.

1.06: 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.
      
1.07: Incomplete version, used old documentation and contained no binary
      distribution. Discarded.

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

1.09: Code cleanup, usage information improved.

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

1.11: Again a minor update. I'm not even sure that I will upload this version
      to tsx-11 and sunsite.

1.20: Major code rewrite. Multiple definition files for callback connections
      supported. Added "direct" option. Docs improved. cbgetty program added.
      
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.

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). 
