What is it? The address, the machines and software involved:
Server software vs. client software
Internet Message Access Protocol (IMAP) is a standard protocol for accessing e-mail from your local server. IMAP (the latest version is IMAP4) is a client/server protocol in which e-mail is received and held for you by your Internet server. You can view just the heading and the sender of the letter and then decide whether to download the mail. You can also create and manipulate folders or mailboxes on the server, delete messages, or search for certain parts or an entire note. IMAP requires continual access to the server during the time that you are working with your mail.
A less sophisticated protocol is Post Office Protocol 3 (POP3). With POP3, your mail is saved for you in your mailbox on the server. When you read your mail, all of it is immediately downloaded to your computer and no longer maintained on the server.
IMAP can be thought of as a remote file server. POP can be thought of as a "store-and-forward" service.
POP and IMAP deal with the receiving of e-mail from your local server and are not to be confused with Simple Mail Transfer Protocol (SMTP), a protocol for transferring e-mail between points on the Internet. You send e-mail with SMTP and a mail handler receives it on your recipient's behalf. Then the mail is read using POP or IMAP.
Client Software - Outlook Express
Setting it up
Sending, receiving, reply, forward
The Address Book and Distribution Lists
Digital vs. Analog and Binary Code
Bit = binary digit
It is a sequence of bits that represent the data. The File Header explains what kind of data it is.
8 bits = 1 byte 4 bits = nibble KB vs. Kb
Kilo = 1,024 or 1,000
Mega = million
Giga = billion
Tera = trillion
Exa = quintillion
Holds raw data waiting to be processed
Holds results of processing until it is stored
Capacitors hold data as on/off
SDRAM (synchronous dynamic RAM)
Holds start-up routine
Keyboard, display and drive info
Complementary metal oxide semi-conductor
More permanent than RAM less than ROM
Uses a battery on the mother board to “remember”
Date/time and system setup
Microscopic magnetized particles
High density is about the closeness and size of particles
Pits and Lands
Floppy and Hard Drives are Magnetic
CD-ROM, DVD, CD-R, CD-RW are optical
Size measured in bytes
Controllers position the disk and the read/write heads
Ultra ATA (AT Attachment) vs. Enhanced Integrated Drive Electronics EIDE
SCSI or Small Computer Systems Interface
Disk – controller – Processor – RAM
DMA or Direct Memory Access allows skip the processor and go right to RAM
A Sector is the smallest unit that can be accessed on a disk. When a disk undergoes a low-level format, it is divided into tracks and sectors. The tracks are concentric circles around the disk and the sectors are segments within each circle. For example, a formatted disk might have 40 tracks, with each track divided into 10 sectors. The operating system and disk drive keep tabs on where information is stored on the disk by noting its track and sector number.