newbie: sccm/wsus updates to client help

please refer to my pics:

#1

pic #2

Pic #1, does this mean that only 25 or 27 client machines received the updates ? If so......<o:p></o:p>

a) where can I check which client machines these are, that's is, ones that got the updates ? <o:p></o:p>

b) where can I check the client machines that didn't get the updates ?<o:p></o:p>

c) Does pic #2 indicate that 399 clients are communication w/ sccm/wsus  and other 93 are not ?

d) from client end, is there a way to test whether client is connecting to sccm/wsus ?

Thanks !<o:p></o:p>