How do I see what version of bitcoin core my wallet uses I use the multibit wallet which I understand doesn't download the whole bitcoin core i.e. the entire block chain, but it must use the bitcoin core protocol right? So how do I see which version of the protocol my wallet is using?
In the Multibit data directory, there is a file called log/multibit.log. When you connect to a peer, it will write something like this to the log:

20:01:26.124 [bitcoinj user thread] DEBUG o.m.c.b.BitcoinPeerEventListener - Connected to peer:
client version: 70002
local services: 1
time:           1424228484
my addr:        [xx.xx.xx.xx]:51127
their addr:     [xx.xx.xx.xx]:8333
sub version:    /Satoshi:0.10.0/
best height:    343977
delay tx relay: true


The 'sub version' field contains the version in a human readable format. The 'client version' field contains a machine-readable protocol version.