PNET_GETVAR - Gets any matlab variable (number-, cell-, struct- or object -array) from pnet.
Receives matlab variables over a TCP connection that was sent with
PNET_PUTVAR. This variable transfer uses its own non standard protocol.
Can also be used with UDP packets if the variable/variables fits inside
an UDP packet.
Se also: PNET_PUTVAR, PNET, PNET_REMOTE