Sample output without using sleep ( win98 - ActiveState 5.8.0 build ):

C:\Perl\bin\hw>perl pg5.pl
I'm a perl programmer!
I like computing!
'Thread1' returned Threading in perl is fun!
'Thread2' returned Computing is cool!

C:\Perl\bin\hw>perl pg5.pl
I'm a perl programmer!
I like computing!
'Thread1' returned Threading in perl is fun!
'Thread2' returned Computing is cool!

C:\Perl\bin\hw>perl pg5.pl
I'm a perl programmer!
I like computing!
'Thread1' returned Threading in perl is fun!
'Thread2' returned Computing is cool!

C:\Perl\bin\hw>perl pg5.pl
I'm a perl programmer!
I like computing!
'Thread1' returned Threading in perl is fun!
'Thread2' returned Computing is cool!

C:\Perl\bin\hw>