$^X is just a special variable, and it contains a string representing the full path to the current Perl interpreter. This is very helpful if you have more than one Perl installed.
For example, try running the following:
perl -e 'print $^X'
On the Win32 machine I'm using here at work, with ActiveState Perl, this prints:
C:\Perl\bin\perl.exe
<-radiant.matrix->
Larry Wall is Yoda: there is no try{} (ok, except in Perl6; way to ruin a joke, Larry! ;P)
The Code that can be seen is not the true Code
"In any sufficiently large group of people, most are idiots" - Kaa's Law
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