the application layer

 the application layer f the OSI model marks the spot where users actually communicate to the computer. this layer comes into play only when it appears that access to the network is going to be needed soon.

take the case of internet explorer. you could uninstall every networking component from a system. such a TCP / IP  NIC card and so on and you could still use IE to view a local HTML document no problem but things would definitely get messy if you tried to do something like view an HTML document that must be retrieved using HTTP or nab a file with FTP or TFTP.

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