Standard CGI Variables (DCL symbols)
----------------------
  $FACILITY == "%X00000003"
  $IDENT == "%X00000000"
  $RESTART == "FALSE"
  $SEVERITY == "1"
  $STATUS == "%X00030001"
  AUTH_TYPE == ""
  CONTENT_LENGTH == "0"
  CONTENT_TYPE == ""
  CSP_NONCE == "54eb6a31b414e45dbd40d18c0a07b97"
  DOCUMENT_ROOT == ""
  GATEWAY_EOT == "$D-544AF403426C8D6841838449-"
  GATEWAY_ESC == "$E-A851A3769222E37FAEFC9FB4-"
  GATEWAY_INTERFACE == "CGI/1.1"
  GATEWAY_MRS == "16492"
  GATEWAY_SYMBOLS == "AUTH_TYPE,CONTENT_LENGTH,CONTENT_TYPE,CSP_NONCE,DOCUMENT_ROOT,GATEWAY_INTERFACE,GATEWAY_EOT,GATEWAY_ESC,GATEWAY_MRS,HTTP_ACCEPT,HTTP_USER_AGENT,HTTP_ACCEPT_ENCODING,HTTP_HOST,PATH_INFO,PATH_ODS,PATH_TRANSLATED,QUERY_STRING,REMOTE_ADDR,REMOTE_HOST,REMOTE_PORT,REMOTE_USER,REQUEST_METHOD,REQUEST_PROTOCOL,REQUEST_SCHEME,REQUEST_TIME_GMT,REQUEST_TIME_LOCAL,REQUEST_URI,SCRIPT_FILENAME,SCRIPT_NAME,SERVER_ADDR,SERVER_CHARSET,SERVER_GMT,SERVER_NAME,SERVER_PROTOCOL,SERVER_PORT,SERVER_SIGNATURE,SERVER_SOFTWARE,UNIQUE_ID,KEY_COUNT"
  HTTP_ACCEPT == "*/*"
  HTTP_ACCEPT_ENCODING == "gzip, br, zstd, deflate"
  HTTP_HOST == "wasd.vsm.com.au"
  HTTP_USER_AGENT == "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"
  KEY_COUNT == "0"
  PATH_INFO == "/ht_root/src/perl"
  PATH_ODS == "5"
  PATH_TRANSLATED == "WASD_ROOT:[src]perl"
  QUERY_STRING == ""
  REMOTE_ADDR == "18.116.42.136"
  REMOTE_HOST == "ec2-18-116-42-136.us-east-2.compute.amazonaws.com"
  REMOTE_PORT == "62322"
  REMOTE_USER == ""
  REQUEST_METHOD == "GET"
  REQUEST_PROTOCOL == "HTTP/1.1"
  REQUEST_SCHEME == "http:"
  REQUEST_TIME_GMT == "Fri, 01 Nov 2024 07:20:02 GMT"
  REQUEST_TIME_LOCAL == "Fri, 01 Nov 2024 17:50:02"
  REQUEST_URI == "/cgi-bin/CGIplusPM_example1.pl/ht_root/src/perl"
  SCRIPT_FILENAME == "CGI-BIN:[000000]CGIPLUSPM_EXAMPLE1.PL"
  SCRIPT_NAME == "/cgi-bin/CGIplusPM_example1.pl"
  SERVER_ADDR == "119.252.17.13"
  SERVER_CHARSET == "ISO-8859-1"
  SERVER_GMT == "+10:30"
  SERVER_NAME == "wasd.vsm.com.au"
  SERVER_PORT == "80"
  SERVER_PROTOCOL == "HTTP/1.1"
  SERVER_SIGNATURE == "<address>WASD/12.2.5 Server at wasd.vsm.com.au Port 80</address>"
  SERVER_SOFTWARE == "HTTPd-WASD/12.2.5 OpenVMS/IA64 SSL"
  UNIQUE_ID == "9a40854540835e5fd6c"
----------------------

Demonstrate that the CGIplus::var() function and $ENV associative array contents are identical ...

$ENV{'SCRIPT_NAME'}  |/cgi-bin/CGIplusPM_example1.pl|
CGIplus::var('SCRIPT_NAME')  |/cgi-bin/CGIplusPM_example1.pl|

$ENV{'PATH_INFO'}    |/ht_root/src/perl|
CGIplus::var('PATH_INFO'}    |/ht_root/src/perl|

$ENV{'QUERY_STRING'} ||
CGIplus::var('QUERY_STRING') ||

SERVER_SOFT does not exist and looks like an empty string ...
SERVER_SOFT ||

SERVER_SOFTWARE should exist ...
SERVER_SOFTWARE |HTTPd-WASD/12.2.5 OpenVMS/IA64 SSL|