<P> On the Sinclair ZX80 and ZX81 computers, the Break is accessed by pressing Space . On the Sinclair ZX Spectrum it is accessed by Caps Shift + Space . The Spectrum+ and later computers have a dedicated Break key . It does not trigger an interrupt but will halt any running BASIC program, or terminate the loading or saving of data to cassette tape . An interrupted BASIC program can usually be resumed with the CONTINUE command . The Sinclair QL computer, without a Break key, maps the function to Ctrl + Space . </P> <P> On a BBC Micro computer, the Break key generates a hardware reset which would normally cause a warm restart of the computer . A cold restart is triggered by pressing Ctrl + Break . If a filing system is installed, ⇧ Shift + Break will cause the computer to search for and load or run a file called! Boot on the filing system's default device (e.g. floppy disk 0, network user BOOT). The latter two behaviours were inherited by the successor to Acorn MOS, RISC OS . These behaviours could be changed or exchanged in software, and were often used in rudimentary anti-piracy techniques . </P> <P> On many modern PCs, Pause interrupts screen output by BIOS until another key is pressed . This is effective during boot in text mode and in a DOS box in Windows safe mode with 50 lines . On early keyboards without a Pause key (before the introduction of 101 / 102 - key keyboards) the Pause function was assigned to Ctrl + NumLock, and the Break function to Ctrl + ScrLock; these key - combinations still work with most programs, even on modern PCs with modern keyboards . Pressing the dedicated Pause key on 101 / 102 - key keyboards sends the same scancodes as pressing Ctrl, then NumLock, then releasing them in the reverse order would do; additionally, an E1 prefix is sent, which enables 101 / 102 - key - aware software to discern the two situations, while older software usually just ignores the prefix . The Pause key is different from all other keys in that it sends no scancodes at all on release; therefore it is not possible for any software to determine whether this key is being held down . </P> <P> On modern keyboards, the Break key is usually labeled Pause with Break below, sometimes separated by a line, or Pause on the top of the keycap and Break on the front . In most Windows environments, the key combination ⊞ Win + Pause brings up the system properties . </P>

What is the pause key on a keyboard
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