use AIX::Sysinfo;
...
my $host = hostname();           # sub exported from module
my $version = system_version();  # sub exported from module

##</code><code>##

Use AIX::Sysinfo;
...
my $sys = AIX::Sysinfo->new();
my $host = $sys->hostname();

##</code><code>##

use AIX::Sysinfo_var;                       # making this up
my $hostname = $sysinfo_hash{hostname};     # making this up
my $version  = $sysinfo_hash{aix_version};

##</code><code>##

use AIX::Sysinfo_tie;
...
tie %sysinfo, 'AIX::Sysinfo';
my $hostname = $sysinfo{hostname};