I  am  confused.   I  was  under  the impression that with VNC you
can
   access  another computer from anywhere as long as the computer you
are
   trying to access has given you permission.

Here's a couple of things that come to mind.  You can connect from
anywhere *if* it has a public IP, *if* you are both connected to the
Internet, and *if* your respective ISPs allow vnc traffic (which most
would).

   What can I do to ensure that  will be able to access another
computer,
   even  if  I  am  not  on  the  same  internet  connection as the
other
   computer?

Meet the above listed conditions.  I suspect when you were at your
friends house you used their internal net to connect to them, and as
such you used an IP that started with 172.16-31, 10., or 192.168.,
indicating it was a private IP.  When you went home your ISP can't route
to those destinations because they are strictly private IPs (it wouldn't
know where to send the packets) so you couldn't connect.
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