Using this feature has the same result as sending Ctrl+Alt+Del to the desktop and then clicking Log.Original IBM PC 5150 keyboard: It is impossible to press Ctrl+Alt+Del with one hand onlyOr use Delete. Enabling Virtual Printing on the Mac OS X Client 41. In computing, a Control key Ctrl is a modifier key which, when pressed in conjunction with another key, performs a special operation (for. ISO keyboard symbol for 'Control'. A Control key (marked 'Ctrl') on a Windows keyboard next to one style of a Windows key, followed in turn by an Alt key.According to his own account, Mel Hallerman, who was the chief programmer of the project, therefore suggested switching the key combination to Ctrl+ Alt+ Del as a safety measure, a combination impossible to press with just one hand on the original IBM PC keyboard. Bradley, as the chief engineer of the IBM PC project and developer of the machine's ROM-BIOS, had originally usedCtrl+ Alt+ Esc, but found it was too easy to bump the left side of the keyboard and reboot the computer accidentally. The option key on the mac keyboard is also labeled alt and there is usually a delete key, too on larger / external keyboards.The soft reboot function via keyboard was originally designed by David Bradley. FnUp Arrow: Page Up: Scroll up one page.On most remote control software, you select 'Ctrl-Alt-Del' from the menu to send the command to the remote PC. Control-K: Delete the text between the insertion point and the end of the line or paragraph. Fn-Delete: Forward delete on keyboards that don't have a Forward Delete key.
Control+Alt+Delete Mac OS X Client 41Bradley is also known for his good-natured jab at Gates at the celebration of the 20th anniversary of the IBM PC on Augat The Tech Museum:"I have to share the credit. Bradley viewed this work as just one small task out of many: "It was five minutes, 10 minutes of activity, and then I moved on to the next of the 100 things that needed to get done." In a March 2018 email, one of Bradley's co-workers confirmed the command was invented in 1981 in Boca Raton, Florida. The feature, however, was detailed in IBM's technical reference documentation to the original PC and thereby revealed to the general public. Bill Gates (former Microsoft CEO) remembered it as "just something we were using in development and it wouldn't be available elsewhere". Examples of such operating systems include DOS, Windows 3.0 in Standard Mode as well as earlier versions of Windows. The BIOS reacts by performing a soft reboot (also known as a warm reboot). BIOS By default, when the operating system is running in real mode (or in a pre-boot environment, when no operating system is started yet), this keystroke combination is intercepted by the BIOS. Gates stated he would have preferred a single button to trigger the same actions, but could not get IBM to add the extra button into the keyboard layout. During a question and answer presentation on 21 September 2013, Gates said "it was a mistake", referring to the decision to use Ctrl+Alt+Del as the keyboard combination to log into Windows. The text of this rudimentary task manager was written by Steve Ballmer. Windows 3.1x displays a blue screen that allows the user to press Enter to end a task that has stopped responding to the system (if such a task exists) or press Control+Alt+Delete again to perform a soft reboot. If LocalReboot=On (default): According to the value of the LocalReboot option in the section of system.ini, Windows performs one of several actions in response. Winlogon, a core component of the operating system, responds to the key combination in the following scenarios:Invoking Windows Security When a user is logged onto a Windows computer, pressing Ctrl+Alt+Delete invokes Windows Security. Windows NT family The Windows NT family of operating system, whose members do not have "NT" in their names since Windows 2000, reserve Ctrl+Alt+Delete for the operating system itself. If LocalReboot=Off, Windows performs a soft reboot. The user can press Control+Alt+Delete again to perform a soft reboot. ![]() With that in mind, Windows XP uses the Ctrl+Alt+Delete in the following unique scenarios: It may be disabled in favor of the classic plain logon screen, either explicitly by the user or as a consequence of the Windows XP computer becoming part of a Windows domain network. The Welcome Screen of Windows XP, however, does not support the secure attention scenario. Windows XP behavior Windows XP introduces Welcome Screen, a redesigned logon interface. The normal session manager process in OS/2 versions 2.0 and later is the parent Workplace Shell process, which displays the "system is rebooting" window and triggers a soft reboot. OS/2 In OS/2, this keystroke combination is recognized by the OS/2 keyboard device driver, which notifies the session manager process. Windows Vista and the next versions of Windows NT did not inherit any of the above. When a user is logged on to a Windows XP computer and Welcome Screen is enabled, pressing the key combination invokes Windows Task Manager instead of Windows Security. The original Mac OS X Server had an Easter egg in which pressing Control+ ⌥ Option+ Delete (as the Option key is the equivalent of Alt key on a Mac keyboard) would show an alert saying "This is not DOS!". Control+ ⌘ Command+ Power restarts the computer. Instead, ⌘ Command+ ⌥ Option+ Esc brings up the Force Quit panel. Mac Ctrl+Alt+Delete is not a keyboard shortcut on macOS. QEMM) can intercept and turn this into a quick reboot. Some 386 memory managers (e.g. Perform a soft reboot without memory initialization by jumping to IPL reset vector, after broadcasting a pending shutdown event (on AT compatible machines) and flushing disk caches (since DOS 6, or with FreeKEYB loaded). Perform a soft reboot without memory initialization by jumping to IPL reset vector, after broadcasting a pending shutdown event (on AT compatible machines). Equivalents on various platforms Desktop operating systemsPerform a hardware reboot by sending a reset signal to system via keyboard MCU (+ possible extra keycode + max 10s delay if "reset warning" is supported and in use). On Ubuntu Server, it is used to reboot a computer without logging in. Software for mac airPerforms a soft reboot if pressed twice. Bring up "Close Program" dialog box (a simplistic task manager). Performs a soft reboot if pressed twice. Close unresponsive applications. Perform a hard reboot by triggering the chipset's reset logic, after broadcasting a pending shutdown event and flushing disk caches. Perform a soft reboot with memory initialization (aka "cold reboot") by jumping to IPL reset vector, after broadcasting a pending shutdown event (on AT compatible machines) and flushing disk caches.
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