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Save PDF file to Stream and Load PDF file from Stream in C# Step 1: New a PDF instance. Step 2: Create one page. Step 3: Add text to that page. Step 4: Save PDF file to Stream. Step 1: New a PDF instance. Step 2: Load PDF file from stream. Step 3: Save the PDF document . Full Code:

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A side benefit of filtering spam at the receiving server is reduced e-mail In enterprises, performing backups of information is a significant task Backups are size-dependent, both in cost and time, and reducing e-mail by eliminating spam can have significant impacts on e-mail backups Spam reduction will also have a significant impact on the e-discovery process as it reduces the quantity of material that needs to be searched Microsoft offers another server-based solution to spam called the Sender ID Framework (SIDF) Sender ID attempts to authenticate messages by checking the sender s domain name against a list of IP addresses authorized to send e-mail by the domain name listed This list is maintained in a text (TXT) record published by the DNS called a Sender Policy Framework (SPF) record So when a mail server receives an e-mail, it will check the sender s domain name in the DNS; if the outbound server s IP matches, the message gets a pass rating by the SIDF This is similar to the idea that routers should drop any outbound port 25 traffic that does not come from known e-mail servers on the subnet managed by the router However, the SIDF system handles the authentication of the e-mail server when it is received, not when it is sent This system still allows wasted bandwidth from the sender of the message to the receiver, and since bandwidth is increasingly a metered service, this means the cost of spam is still paid by the recipient These methods will take care of 90 percent of the junk mail clogging our networks, but they cannot stop it entirely Better control of port 25 traffic is required to slow the tide of spam hitting our inboxes This would stop spammers using remote open relays and hopefully prevent many users from running unauthorized e-mail servers of their own Because of the low cost of generating spam, until serious action is taken, or spam is somehow made unprofitable, it will remain with us.

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Sec 2-1

Table 2-1

At every stage in the evolution of the personal computer, more and more of the items that once sat on our physical desktops have migrated to the virtual desktop of the personal computer

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The e-mail concerns discussed so far in this chapter are all global issues involving security, but e-mail suffers from a more important security problem the lack of confidentiality, or, as it is sometimes referred to, privacy As with many Internet applications, e-mail has always been a plaintext protocol When many people first got onto the Internet, they heard a standard lecture about not sending anything through e-mail that you wouldn t want posted on a public bulletin board Part of the reason for this was that e-mail is sent with the clear text of the message exposed to anyone who is sniffing the network Any attacker at a choke point in the network could read all e-mail passing through that network segment Some tools can be used to solve this problem by encrypting the e-mail s content The first method is S/MIME and the second is PGP S/MIME is a secure implementation of the MIME (Multipurpose Internet Mail Extensions) protocol specification MIME was created to allow Internet e-mail to support new and more creative features The original e-mail RFC specified only text e-mail, so any nontext data had to be handled by a new specification MIME MIME handles audio files, images, applications, and multipart e-mails MIME allows e-mail to handle multiple types of content in a message, including file transfers Every time you send a

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Hardware Choices Performance and Cost Parameters of Some Storage Devices Magtape Disk devices Memory Floppy Micro Pack Giant Fixed

Shugart Seagate IBM IBM DEC Univac 851 8 XT 5 2319b 3380 RS-64 1106 Double Stack Stack Module Single 1970 1983 1962 1980 1956 1948

The typewriter was replaced by the word processor The calendar was replaced by the scheduling application The desktop calculator was replaced by its software counterpart The dictionary was replaced by the spell checker The personal stereo system was replaced by the PC's built-in CD player The "In" and "Out" boxes were replaced by e-mail The RolodexTM was made obsolete by contact management software The fax machine was replaced by scanners and fax modems



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The telephone is the only item on the desktop that hasn't been greatly affected by the information technology revolution CT is the technology that is bringing about the evolution of the telephone Configurations for desktop CT solutions are covered in s 11 and 12, where your questions about the next step in this evolution will be answered A significant benefit of this function migration to the personal computer's virtual desktop is that with a laptop computer or PDA you can simply pick up your entire desk and take it anywhere you want With the next generation of information appliances, the appropriate parts of your office will be available to you in your car, your living room, or on your refrigerator door

Cost per year: $/M char d O -line 12 17 17 20 1 130K e On-line 150 200 43 600 20 8K 320K Capacity: Char f 3K 8192 8704 7294 50K 4K per track Min block 6 256 512 2 32 64 1 Max block 45M 1024 512 7294 50K 4K 196K per device 53M 12M 1016M 278M 2400M 128K 2M Gap size 600 60 130 200 524 167 Char Block access time: ms 16 026i Seek (s) 90K 141h 306 60 Latency (r) 250 833 833 125 83 1667 Transfer rate( t ): Char/ms Write 120 62 655 312 3000 125 8K Read 120 62 655 312 3000 125 8K ms Block transfer time ( btt )j : (for B char: 2400 1024 512 2400 2400 2400 2400) Write 20 165 82 77 08 19 03 Read 50 34 82 77 2 19 03 k 40 167 166 25 166 34 0 Rewrite(TRW )

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