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all the answers above are wrong..the only differnce between tcp and udp is reliabilty and ordering of packets. Since we should use UDP we have to make sure that we incorporate these attributes in our application itself.
In order to ensure reliability we have to make use of retransmissions and acknowledgements at the application level i.e we have to make our program waiting for an ACK for every packet sent and use a timeout mechanism to retransmit.
Also we should make use of "Sqequence Numbers" in our program in order to ensure the correct ordering of the packets that are received at the receiver.

I think he was looking for basic diff b/w UDP and TCP and how your application will act differently because of those differences.

May be while using UDP, the application has to take care of sending the acks..

I agree with above:
TCP should have:
1, Three-way handshaking begin the networking connection
2, Four-way handshaking end the networking connection
3, SeqNo and ACK guarantted every package should be received by end user. If not, just retransmit data.

Go to wiki for Sliding Window Flow Control

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