PERLS predefind modules

I need to get some info on the ENV and Socket modules that are defined in perl. <br>
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How can I be sure that perl is finding these modules? <br>
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I have some perl code that includes the following lines. <br>
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use lib &quot;$ENV{HOME}&quot;;<br>
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What does this do. How I can list the Environment defined in this module. <br>
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I have another chunk of code that gets a socket. <br>
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$nRet = socket(SOCK, PF_INET, SOCK_STREAM, $Protocol);<br>
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When I run this program from the command prompt the socket is created and the program continues. However when I call the program from a Java application I don't get the socket connection. I suspect the program can't find the socket module. How can I make it find this module. <br>
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Thanks for all of your help. <br>