2_4_client.c

#include <stdio.h>
#include <stdlib.h>

int main ()
{
	char* server_name = getenv ("SERVER_NAME");
	if (server_name == NULL)
	/* The SERVER_NAME environment variable was not set. 
	   Use the default. */
	server_name = "server.my-company.com";
	
	printf ("Accessing server %s\n", server_name);
	/* Access the server .... */
	
	return 0;
}