open MYCLASS, "$filename";
print MYCLASS;   #print to MYCLASS or call MYCLASS->print?

##</code><code>##

sub new(*) {...}
open MYCLASS, $filename;
new MYCLASS;   #main::new(*MYCLASS) or MYCLASS->new?

##</code><code>##

sub new(*) {...}
open CGI, $filename;
new CGI;   #main::new(*CGI) or CGI->new?