# run xx.exe word_up and get the output of that program in a variable
my $xx_output = `xx.exe word_up`;

# just plain run the program... let the output go to the terminal
# just as it would be if you ran it at your dos prompt
system "xx.exe word_up";

##</code><code>##

echo stuff | foo.exe

##</code><code>##

foo.exe stuff

##</code><code>##

foo.exe < stuff

##</code><code>##

------------
:Wq
Not an editor command: Wq