if what u need to know is how to prepolulate a form with data which is being passed to it , use the CGI module's param method; to use your example
#!/usr/bin/perl
use strict;
use CGI qw(cgi);
my $cgi = new CGI;
print "<html><body><form>\n<input type=text name=car value=" . $cgi->p
+aram('enter'); . "></form></body>"
this will display the value of the 'enter' parameter (i.e. car) in the html form
hth...
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