Major changes in release 1.3:

* Create a lock file.
  wmpccard of this version can bind a new socket even when a socket
  file not bound by any process is remained.

Major changes in release 1.2:

* Fix a bug that wmpccard doesn't remove a socket file when it exits
  because of disconnection from X server.

Major changes in release 1.1:

* wmpccard asks pccardd about the latest status of all slots when
  SIGHUP is delivered.
* The `-t' option is added.
* Fix minor bugs.