Anything that connects to a server on the internet opens a connection through your firewall and provides a potential conduit for hackers directly to your inside network.
The mail client (Netscape Mail, Lotus Notes, Microsoft Outlook, etc). opens a connection to it's default mail server.
The task of the Communicator Class is to open a connection to the serial port, and read and write an array of bytes to/from it.
Under the original HTTP protocol, a client, such as a Web browser, must open a connection to a server, make a request, wait for a response, and then close the connection.
When applications open a connection to another computer on the Internet, the messages they send (using a specific application layer protocol) get passed down the stack to the TCP layer.
A good host-based firewall will warn you, for example, that the program you just downloaded is trying to open a connection to a pirate Web server in Russia; you can then choose to either allow the connection to go through or terminate it.
Either way, an internet-capable device can then perform a lookup for a particular domain name, and this hierarchical system of servers turns it into an IP address, which can be used to open a connection to the machine in question.But DNS was designed when the internet was very small, and all its users were known and trusted.
More specifically, this example relies on the Java reflection API to open a connection to the HSQLDB database manager system.
During neighborhood skull sessions in 1999, locals were eager to open a connection to the University and soften the Midway's uninviting immensity.
Figure 6 presents the average time used to open a connection and the latency between the production and the consumption of a stream item.
