You can use the fork method of a GRID::Machine object. (See GRID::Machine::Process)

    $ cat -n fork5.pl 
     1  #!/usr/bin/perl -w
     2  use strict;
     3  use GRID::Machine;
     4  use Data::Dumper;
     5  
     6  my $host = $ENV{GRID_REMOTE_MACHINE};
     7  my $machine = GRID::Machine->new( host => $host );
     8  
     9  my $p = $machine->fork( q{
    10  
    11     print "stdout: Hello from process $$. args = (@_)\n";
    12     print STDERR "stderr: Hello from process $$\n";
    13  
    14     use List::Util qw{sum};
    15     return { s => sum(@_), args => [ @_ ] };
    16   },
    17   args => [ 1..4 ],
    18  );
    19  
    20  # GRID::Machine::Process objects are overloaded
    21  print "Doing something while $p is still alive  ...\n" if $p; 
    22  
    23  my $r = $machine->waitpid($p);
    24  
    25  print "Result from process '$p': ",Dumper($r),"\n";
    26  print "GRID::Machine::Process::Result objects are overloaded i
+n a string context:\n$r\n";
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When executed, the former program produces an output similar to this:

  $ perl fork5.pl 
  Doing something while 5220:5230:some.machine:5234:5237 is still aliv
+e  ...
  Result from process '5220:5230:some.machine:5234:5237': $VAR1 = bles
+s( {
                   'machineID' => 0,
                   'stderr' => 'stderr: Hello from process 5237
  ',
                   'descriptor' => 'some.machine:5234:5237',
                   'status' => 0,
                   'waitpid' => 5237,
                   'errmsg' => '',
                   'stdout' => 'stdout: Hello from process 5237. args 
+= (1 2 3 4)
  ',
                   'results' => [ { 'args' => [ 1, 2, 3, 4 ], 's' => 1
+0 } ]
                 }, 'GRID::Machine::Process::Result' );

  GRID::Machine::Process::Result objects are overloaded in a string co
+ntext:
  stdout: Hello from process 5237. args = (1 2 3 4)
  stderr: Hello from process 5237
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The fork method returns a GRID::Machine::Process object. The first argument must be a string containing the code that will be executed by the forked process in the remote machine. Such code is always called in a list context.