I am having a below code : 
join(";" ,$hXCR{$M}{GD} {0}{SKT}||0 ,$hRCX1{$M}-> {GD}->{'*'}->{SKT}||
+0 );

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I am not getting what $hXCR{$M}{GD} {0}{SKT}||0 this indicates. I understand $hXCR{$M}{GD} is a hash with key and value but then what {0}{SKT}||0 means here and what is this code about $hRCX1{$M}-> {GD}->{'*'}->{SKT}||0 I mean what arrow indicating here.

In reply to query on hash understanding by Ritz@Perl

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