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A computer keyboard with the Esc key in the top-left corner IBM 83-key keyboard (1981), with Esc in the top-left corner of the alphanumeric section. On computer keyboards, the Esc keyEsc (named Escape key in the international standard series ISO/IEC 9995) is a key used to generate the escape character (which can be represented as ASCII code 27 in decimal, Unicode U+001B, or Ctrl+[).
Backdoor compared with the dominant (front door) in the chromatic circle: they share two tones and are transpositionally equivalent. In jazz and jazz harmony, the chord progression from iv 7 to ♭ VII 7 to I (the tonic or "home" chord) has been nicknamed the backdoor progression [1] [2] or the backdoor ii-V, as described by jazz theorist and author Jerry Coker.
The latter two display a menu with the currently selected input method highlighted, and debuted in Windows 8. ⊞ Win + ⇧ Shift + Space goes through the list backwards. For the first two shortcuts going backwards is done by using the right ⇧ Shift key instead of the left.
A hardware backdoor is a backdoor implemented within the physical components of a computer system, also known as its hardware. They can be created by introducing malicious code to a component's firmware , or even during the manufacturing process of a integrated circuit , known as a hardware trojan .
A backdoor may take the form of a hidden part of a program, [7] a separate program (e.g. Back Orifice may subvert the system through a rootkit), code in the firmware of the hardware, [8] or parts of an operating system such as Windows. [9] [10] [11] Trojan horses can be used to create vulnerabilities in a device.
The amendment 1 of ISO/IEC 9995-2:2009, which was published in 2012, specifies two ways of the emulation of a numeric keypad within the alphanumeric section of a keyboard. One way, with mappings to keys in the left half of the alphanumeric section (shown green in the diagram above), emulates a numeric keypad with the digits 1,2,3 in the upper row.
All common sequences just use the parameters as a series of semicolon-separated numbers such as 1;2;3. [5]: 5.4.2 Missing numbers are treated as 0 (1;;3 acts like the middle number is 0, and no parameters at all in ESC[m acts like a 0 reset code). Some sequences (such as CUU) treat 0 as 1 in order to make missing parameters useful. [5]: F.4.2
1 CLK. 2 DATA 3 N/C 4 GND 5 +5V 1 start bit, 8 data, 1 parity (odd), 1 stop bit keyboard reset via command string Supported PS/2 "PS/2 port" 6-pin Mini-DIN (DIN 45322) 1 DATA. 2 N/C (or MOUSE DATA) 3 GND 4 +5V 5 CLK 6 N/C (or MOUSE CLK) Later PC compatibles 4-pin USB Type A connector 1 +5V. 2 Data − 3 Data + 4 Ground. sync field plus 8-bit ...