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Pick an apple! 
 
Copy Before Submitting Web Forms

Filling in Web forms (like the one used to submit this tip) can be a bit of a gamble - you put in your pearls of wisdom, perhaps only to lose them all if the Web page flakes out or the browser crashes. Instead of losing all your text, "save" it by pressing Command-A to select all and then Command-C to copy the selected text to the clipboard. Do this periodically as you type and before you click Submit, and you may "save" yourself from a lot of frustration. It takes just a second to do, and the first time you need to rely on it to paste back in lost text, you'll feel smart.

Submitted by
Larry Leveen

 
 

Ethernet and Internet

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Ethernet and Internet -- Rob Russell of Auckland, New Zealand <rob@sumware.co.nz> pointed out what seemed to be a contradiction in the second installment of the Hey, I'm Talking To You article (see NetBITS-002) about how machines find each other over an Ethernet network and over the Internet. The article stated the Internet doesn't use Ethernet, because Ethernet LANs - segments in which all the machines "see" each other - only work over short distances. But if you hadn't read part 1, last week's sequel seemingly implied TCP/IP couldn't run over Ethernet.

The confusion probably stems from writing about physical protocols (like Ethernet) and data protocols (like TCP/IP) at the same time. Data you send, such as a Web page request, is encoded into a set of TCP packets with IP addresses on them. Once the packets leave the application that assembles them on a particular machine, the physical protocols take over to move the packets along the machine's physical network connection. One Ethernet device talks to another to pass along the TCP packets; if the packets are bound for an outside network, they may go over a serial line that uses a different physical protocol. So regardless of whether you're sending data over a local Ethernet or between routers using leased telephone company lines, the data format is still TCP using IP addressing. The medium, in this case, is not the message, just the carrier. [GF]

 

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