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Operating systems didn t have windows and pretty icons The interface to the mainframe was a command line, but it worked just fine for the time The cavemen who first lifted their heads up from the computer ooze known as mainframes said to themselves, Wouldn t it be great if we could access each other s computers from the comfort of our own caves That was what started the entire concept of a network Back then the idea of sharing folders or printers or Web pages wasn t even yet considered The entire motivation for networking was so people could sit at their dumb terminals and, instead of accessing only their local mainframes, access totally different mainframes The protocol to do this was called the Telnet Protocol or simply Telnet Even though PCs have replaced mainframes for the most part, Telnet still exists as the way to connect remotely to another computer via the command line (Figure 9-20) Telnet runs on TCP port 23, enabling you to connect to a Telnet server and run commands on that server as if you were sitting right in front of it

The functions shown in Table 19-4 provide wide-character versions of the standard numeric and time conversion functions These functions use the header <wcharh>

Wireless headset technology Spread-spectrum radio frequency technology is preferred because it is least susceptible to interference from other wireless headset users in close proximity

size_t wcsftime(wchar_t *str, size_t max, const wchar_t *fmt, const struct tm *ptr)

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This way, you can remotely administer a server and communicate with other servers on your network As you can imagine, this is sort of risky If you can remotely control a computer, what is to stop others from doing the same Thankfully, Telnet does not just allow anyone to log on and wreak havoc with your network You must enter a user name and password to access a Telnet server Unfortunately, Telnet does not have any form of encryption If someone intercepted the conversation between a Telnet client and Telnet server, he or she would see all of the commands you type as well as the results from the Telnet server As a result, Telnet is rarely used on the Internet and has been replaced with Secure Shell (SSH), a terminal emulation program that looks exactly like Telnet but encrypts the data NOTE Telnet only enables command-line remote access, not from a GUI If you want to access another computer s desktop remotely, you need another type of program

double wcstod(const wchar_t *start, wchar_t **end);

The display area should not be confused with other areas of a telephone set's surface that may use LCD as a technique for implementing lamps In Figure 10-20 there is only one display area, which is one line high and 17 characters across, but it also uses a portion of the same LCD as a message-waiting indicator and a lamp that indicates that forwarding is active

Even though Telnet is less common than SSH, Telnet is a popular second option to connect to almost anything on a trusted TCP/IP network Most routers have Telnet access capability (although many router admins turn it off for security) Almost every operating system has a built-in Telnet client and most operating systems though not all Windows operating systems come with built-in Telnet servers Almost every type of server application has some way for you to access it with Telnet It was once quite common, for example, to administer Apache-based Web servers through Telnet NOTE By default, Windows Server 2008 does not have Telnet Server or Telnet Client installed, though you can install both through Server Manager | Features | Add Features Windows Vista, likewise, does not have Telnet Client installed It is available for quick installation in Programs and Features

(table continued on next page)

Wireless telephone stations are those that connect to a switch through a wireless "line" rather than a cable of some sort (see 8, section 87) Wireless stations may connect to a public switch, or to a PBX, or in some implementations may connect to a public switch automatically if a designated PBX is not accessible Wireless telephone stations tend to have many of the same features that apply to desk sets, but are constrained by the fact that they must be as small as possible

strftime( ) In C99 str,fmt, and ptr are qualified by restrict strtod( ) In C99 start and end are qualified by restrict

The oldest Telnet server, found on UNIX and Linux systems, is the venerable telnetd Like most UNIX/Linux servers, telnetd isn t much to look at, so let s move over to the Windows world Since Windows itself doesn t have a built-in Telnet server, we lean toward third-party server programs like freeSSHd (Figure 9-21) Note the name freeSSHd, not freeTelnet As Telnet fades away and SSH becomes more dominant, it s hard to find a Telnet-only server these days All of the popular Telnet servers are also SSH servers

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