No. client is not a server at a particular point of time. but in some other time it may act as a server depending upon its configuration.
So there is no ans. arises of ur question of 2nd part .

I know what you want to ask "Can we have Client and Server in both machine"?
Answer is Surely Yes.

A client can't be server at the same time. At a time it can either be client or server.
A client can act as a server or a server can act as a client when there is peer to peer communication else its not possible

it depends on the number of application. A server can be a client at the same time for a different application.

a host can act as a client as well as a server in the case of peer to peer communication and both of the hosts involved have got equal responsibilities and status

In domain module client never act as a serve but if we think abourt workgroup module client act as a server

At a time server can be work both as a client and server but at a time client can not be server.

yes you install windows xp machine on printer than share on your network .what is server in this question anser who is serve on service called server in this time xp serve printer service but xp is a client os ,so xp in this time on server

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