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an acronym for Blind Carbon Copy - a copy of original e-mail message to some recipient. It is different from "cc" (Carbon Copy) in the sense that the name of the person is not disclosed in the E-mail message to other recipients.

Making a "bcc" of e-mail messages is a common feature in most of the E-mail client software available.

If you "bcc:" an E-mail message to a person, it means you are sending a replica of the E-mail message to that person in addition to the existing recipients, without disclosing the identity of the person to others.

branch if carry clear.
A 6502 opcode. To perform 2-byte addition, you can do this:
    LDA a
    ADC b
    STA c
    BCC s1
    LDA a+1
    ADC b+1
    STA c+1

Oracularity 582-08

The Usenet Oracle has pondered your question deeply. 
Your question was:

>     So Orrie old chum, what this "Bcc" business in the headers of my
> document.

And in response, thus spake the Usenet Oracle:

} "Bcc" stands for Blind Carbon Copy.  But that doesn't tell you much.
} Sit back and learn a bit of Net lore.
} Back in the ancient, cloudy, misty days of the ancestors of the
} Internet, back around 1979, an old, worn-out blues musician used to
} warm his tired bones in the sun on Sproul Plaza at the University of
} California, Berkeley, from time to time putting his old harmonica to
} his mouth and playing a riff or two, and now and then saying "God
} bless you" to some kind soul who had thrown a coin in his battered old
} derby.
} Come December it grew cold, even in California, and the venerable
} blues man began looking for a building he could doze in without being
} thrown out.  Eventually he discovered the Computer Center, an ideal
} place because in those glorious days the only people using it were
} True Hackers who worked at night and slept during the day, mostly face
} down alongside their keyboards.  Once our protagonist had rescued an
} old Cal sweatshirt from a trash can and begun wearing it while he
} napped at a terminal station, no one questioned his right to be there.
} This old blues man, of course, was none other than Blind Carbon Copy.
} He had picked up the majority of his nickname back in the '20s, when
} as a boy he would sneak into the honky-tonks and listen to the sweet
} Delta blues he heard there, then sneak back home and practice what
} he'd learned.  One night when a young Al Jolson was performing, Bcc
} was so caught up in the music that he forgot to wait until he was home
} to practice, and when Al and the boys came out the stage door they
} found a young boy in the alley singing his heart out in a perfect
} imitation of the Master.  "Al, that boy just a carbon copy of you,"
} the bass man said, and the name stuck.
} Now Blind Carbon Copy wasn't blind, but did you ever hear of a Delta
} blues man who wasn't nicknamed Blind something?
} --Well, after a few days of napping in the Berkeley lab Bcc got
} curious about what all those red-eyed young-'uns was doing there, and
} he started moving from monitor to monitor and reading over people's
} shoulders.  He couldn't make much out of FORTRAN or C code, but every
} now and then he'd come upon someone reading his e-mail, and he'd read
} the message, and make a song out of it if he could, walking off into
} the center of the room and softly accompanying himself on his blues
} harp:
}     I've got a na-aasty bug, an' I'm feelin' mighty blue
}     <WaaAHHH-yaaa-yaaa, ya-aaa-aaa-WAAAA-aah-ahh>
}     I said mah code's got a big bug, makes me feel so goddam blue
}     <WaaAHHH-yaaa-yaaa, ya-aaa-aaa-WAAAA-aah-ahh>
}     Mah core's gone an' dumped me, said mah programmin' days was
}     through! <Bumpety-bumpety-bumpety bump bump BUMP.>
} His lyrics eventually worked their way into the bleary consciousnesses
} of the Berkeley hackers.  Dumbfounded at first, they quickly warmed to
} the idea of improvisational blues e-mail, and pretty soon got in the
} habit of calling Blind Carbon Copy over--when he was awake, of
} course--when they had received a particularly promising message that
} they wanted him to render.  Some of the more musical of the group got
} Bcc to teach them how to sing the blues too, and began doing their own
} riffs when Bcc was asleep or away.
} Well, the Berkeley group split up, as all things will; Bcc went back
} to Louisiana to live with his daughter's family, the hackers
} graduated, or got jobs, or became bums.  But whenever one of them sent
} e-mail to someone working with one of the old crowd, they'd attach a
} header reading, let's say, "Blind Carbon Copy: William Joy", to
} indicate that the recipient should call Bill Joy over to do the blues
} on the message.
} Before long the header was shortened to the standard "Bcc" in Berkeley
} sendmail.  But the tradition lives on.  Mostly nowadays the Bcc
} heading is just a ritual gesture, and few are the companies and
} schools where people know enough Net history to call for one of their
} colleagues to come sing their e-mail when they have a Bcc line.  But
} now you know, and you know what to do, and remember, above all, that
} even if you get funny looks when someone's reading over your shoulder
} and laying down that e-mail wail, there's an old Delta blues man,
} lying in a bed in an old-folks home in Baton Rouge now, who hears and
} is blessed every time you sing them.
} Blind Carbon Copy--part of your Internet heritage!
} (This Oracularity sponsored by the Internet Cultural Task Force, the
} Corporation for Public Broadcasting, and the Louisiana Office of
} Tourism.)
A 6502 instruction that performs a branch if the C (carry) flag is cleared (for example, by an ALU instruction or CLC).
  • Function: If(!C) PC + N => PC
  • Synonym: BLT
  • Updates flags: none
  • Opcode number: $90

As opposed to BCS
See also: 6502 instructions | 6502 addressing modes

Motorola 68HC11 Microcontroller Assembly Language Instruction

Branch if Carry Clear. If the "C" bit in the CCR is set, this instruction will cause the program to jump ahead or backwards a relative number of bytes. The instruction allows you to jump 127 bytes ahead, or 128 bytes backwards (using 2's complement numbers).

Boolean Expression:
?C = 0

Hex Equivalent OpCode / Addressing Mode:
$24 Relative (1 byte number in positive or 2's complement form indicating the number to add to the program counter)

Condition Codes:
S: N/A
X: N/A
H: N/A
I: N/A
N: N/A
Z: N/A
V: N/A
C: N/A

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