- <para>Execute external program. The key is true, if the program returns
- with exit code zero. The whole event environment is available to the
- executed program. The program's output printed to stdout, is available in
- the RESULT key.</para>
+ <para>Execute a program. The key is true, if the program returns
+ successfully. The device properties are made available to the
+ executed program in the environment. The program's output printed to
+ stdout, is available in the RESULT key.</para>