Using the extensions

Each extension has a subroutine name, arguments, and return value. In the examples,
text that is formatted like this
shows the extension subroutine name and its arguments and 
text that is formatted like this
shows the kind of code that you might write to implement the extension.

To use the extensions, create a new global Perl script and add the extension subroutines to the script. The package hooks call the subroutines by name; verify that their names are capitalized and spelled correctly in the script.