What should TCP/IP do if one computer changed its IP address which we are sending data to?

What should TCP/IP do if one computer changed its IP address which we are
sending data to?

References

Reference NO 1

http://stackoverflow.com/questions/15185749/what-should-tcp-ip-do-if-one-computer-changed-its-ip-address-which-we-are-sendin

Reference NO 2

http://en.wikibooks.org/wiki/A-level_Computing/AQA/Computer_Components,_The_Stored_Program_Concept_and_the_Internet/Structure_of_the_Internet/TCP_IP_protocol_stack

Reference NO 3

http://www.ckollars.org/stoptypes.html

Reference NO 4

http://www.w3schools.com/tcpip/tcpip_intro.asp

Reference NO 5

http://technet.microsoft.com/en-us/library/cc750854.aspx

Reference NO 6

http://www.hardwaresecrets.com/printpage/How-TCP-IP-Protocol-Works-Part-1/433

Reference NO 7

http://www.ee.columbia.edu/~bbathula/courses/HPCN/chap03_part-1.pdf

Reference NO 8

http://tools.ietf.org/html/rfc1180