Get information about the computer. The result is a struct holding information
about your computer. Top-level flags in the returned struct are available on all
operating systems and identify the operating operating system: 'macintosh',
'windows', 'osx'. All other fields in the returned struct are
platform-dependent.
OS X: results contains a hierarchial struct with major and minor fields names as
with BSD's sysctl(3) MIB fields.
SCREEN 'Computer' not longer supports the obsolete usage:
[model,owner,system,processor,cache,fpu,hz,busHz,vm,pci,emulating]=SCREEN('Computer')