Didn't know how to do it, tried with 'system'. From command line system("C:/<properpath>/AcroRd32.exe", "mypdf.pdf") is working, from WWW it isn't (no error is displayed, no new Acrobat window). I started scanning Perlmonks, but it seems everyone wants to display PDF in browser's window/tab (e.g. Opening PDF through CGI). OK, this form suits me too. I digged through Mason's documentation and found proper code and the only problem that remains is: how to open PDF in browser's new tab/new window instead of current one? Here is the code of some HTML page:

% if($ddc_generatePDF)
% {
<& '/pdf_templates/generatePDF.html',
  data => $data,
  data2 => $data2,
  fileName => 'D:/project1/printouts/mypdf.pdf'
&>

<& '/pdf_templates/displayPDF.html',
  fileName => 'D:/project1/printouts/mypdf.pdf'
&>
% }
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Here code of generatePDF.html

<%args>
data
data2
fileName
</%args>
<%init>
use constant mm => 25.4/72;
use constant in => 1/72;
use constant pt => 1;
</%init>
<%perl>
PDF::Reuse::prFile($fileName);
...some other commands...
PDF::Reuse::prEnd();
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Here, code of displayPDF.html:

<%args>
$fileName
</%args>

<%init>
use Apache2::SubRequest;
my $subr = $r->lookup_file($fileName);
return 404 unless -f $fileName and $subr->status == 200;
$r->content_type($subr->content_type);
# $r->send_http_header;
return 200 if $r->header_only;
$subr->run;
$m->abort;
</%init>
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Any help appreciated. And virtual beer for one more hint: how to open print dialog programmatically after displaying PDF?

I am working on Win XP, but it will be installed on Linux.