You can kind of do this through VMWare View already.
Monitoring> Sessions> arrange the column by "Client ID"
your zero clients will have a very similar uniform mac address.
such as:
1c-5a-3e-xx-xx-xx
1c-5a-3e-xx-xx-xx
1c-5a-3e-xx-xx-xx
or (depending on your Tera version.)
48-44-f7-xx-xx-xx
48-44-f7-xx-xx-xx
48-44-f7-xx-xx-xx
Where as your Soft clients (Vmware view clients) will have a really long string of numbers and letters and will probably also be some or majority of connections coming through your security gateway.
Its not immediately clear but you can figure it out.
hope it helps.