Perl is a powerful file and text processing language available on many platforms. Perl is a useful extension to the TCC batch language, especially if you need advanced string processing capabilities.
The Perl language is not built into TCC, and must be obtained separately. The version supported by TCC is PerlScript (the WSH COM interface), which is included in Active State Perl (free from www.activestate.com).
You must enable Perl support in the OPTION / Startup page. If it is enabled, TCC will automatically load Perl on your system. If a suitable library is found, TCC checks to see if you are running a .PL file. If so, TCC passes the file to your Perl interpreter for processing.