I would encourage you to use ForceArray. Even if it's not necessary here, down the road you'll almost certainly be glad you started out using it. This is how I would go about what you're doing, using ForceArray.
#!/usr/bin/perl -w
use strict;
use XML::Simple;

my $parser = new XML::Simple(ForceArray => 1);
my $ref = $parser->XMLin('c:\temp\file.xml');
foreach my $host (keys(%$ref)){
  foreach my $proc (keys(%{$ref->{$host}[0]->{process}})){
    print "$proc is running on $host\n";
  }
}

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In reply to Re^3: Parsing XML w/ Attributes by jrsimmon
in thread Parsing XML w/ Attributes by jpk236

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