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Technically, OSI s Layers 5 7 each has a specific purpose, but in TCP/IP model lingo, they re all clumped together into the Application layer Technically, all applications that use TCP or UDP sit here; however, the marketplace generally calls Hypertext Transport Protocol (HTTP) traffic Layer 7 Secure Sockets Layer (SSL) is a bit of an odd bird and is not commonly associated with any layer It sits squarely between Layer 4 (TCP) and Layer 7 (Application, typically HTTP), and can be used to encrypt arbitrary TCP streams In general, SSL is not referred to as a layer You should note, however, that SSL can encrypt arbitrary TCP connections, not just HTTP Many protocols, like Post Office Protocol (POP) and Internet Message Access Protocol (IMAP), offer SSL as an encryption option, and the emergence of SSL-virtual private network (VPN) technology shows how SSL can be used as an arbitrary tunnel Extensible Markup Language (XML) data can also be confusing To date, there is no framing protocol for XML that runs on top of TCP directly Instead, XML data uses existing protocols, like HTTP, Dual Independent Map Encoding (DIME), and Simple Mail Transfer Protocol (SMTP) (DIME was created specifically for transmitting XML) For most applications, XML uses HTTP, which, from a layering point of view, looks like this: Ethernet -> IP -> TCP -> HTTP -> XML XML can wrap other XML documents within it For example, Simple Object Access Protocol (SOAP) can wrap digital signatures within it For additional information on XML itself, take a look at wwwoasis-openorg and wwww3corg

While a subprocess is running, you can write to and read from its standard input and output The getOutputStream( ) and getInputStream( ) methods return the handles to standard in and out of the subprocess (I/O is examined in detail in 19)

ProcessBuilder provides another way to start and manage processes (that is, programs) As explained earlier, all processes are represented by the Process class, and a process can be started by Runtimeexec( ) ProcessBuilder offers more control over the processes For example, you can set the current working directory and change environmental parameters ProcessBuilder defines these constructors: ProcessBuilder(List<String> args) ProccessBuilder(String args) Here, args is a list of arguments that specify the name of the program to be executed along with any required command-line arguments In the first constructor, the arguments are passed in a List In the second, they are specified through a varargs parameter Table 16-12 describes the methods defined by ProcessBuilder

11:

Part II:

The final bit of information I want to provide is how to interpret the coordinate system used on your NXT Brick s LCD screen. The LCD screen has a horizontal resolution of 100 pixels and a vertical resolution of 64 pixels. This simply means you could place 100 small dots across the screen and 64 small dots down the screen. Values actually start with a zero, so the range of coordinates for X is 0 99, and for Y, the range is 0 63. When using the DISPLAY block (or any block where you must specify a location on the LCD screen), you specify a location by using its horizontal value (X coordinate) and its vertical value (Y coordinate). So, to place a pixel (or dot) directly in the center of the screen, you would have a DISPLAY block place a Point (see 3 for details on using the DISPLAY block) with an X coordinate of 50 and a Y coordinate of 32.

The Internet Control Message Protocol (ICMP) was especially designed for one host to communicate to another host on the state of the network Since the data is used only by the operating system and not by users, ICMP does not support the concept of port numbers, reliable delivery, or guaranteed order of packets Every ICMP packet contains a type that tells the recipient what the nature of the message is The most popular type is Echo-Request, which is used by the infamous ping program When a host receives the ICMP Echo-Request message, it responds with an ICMP Echo-Reply message This allows the sender to confirm that the other host is up, and since we can see how long it takes the message to be sent and replied to, we get an idea of the latency of the network between the two hosts

To create a process using ProcessBuilder, simply create an instance of ProcessBuilder, specifying the name of the program and any needed arguments To begin execution of the program, call start( ) on that instance Here is an example that executes the Windows text editor notepad Notice that it specifies the name of the file to edit as an argument

class PBDemo { public static void main(String args[]) { try { ProcessBuilder proc = new ProcessBuilder("notepadexe", "testfile"); procstart(); } catch (Exception e) { Systemoutprintln("Error executing notepad"); } } }

NOTE You may hear references to Layer 8 from time to time This is more of a humorous reference/ sarcasm Layer 8 typically refers to the political or financial layer, meaning that above all networks there are people And people, unlike networks, are nondeterministic What may make good technical sense for the network doesn t always make sense from the upper management s perspective A simple example: two department heads within the same company who don t get along with each other When they find out they share the network, they may demand to get their own infrastructure (routers, switches, etc) and get placed on different networks, yet at the same time be able to communicate with each other through secure firewalls only What may have been a nice, simple (and functional) network is now much more complex than it needs to be, all because of Layer 8

Method List<String> command( )