what is the printscreen key on a laptop
Print screen In Microsoft Windows, pressing Prt Sc will capture the entire screen,[1] while pressing the Alt key in combination with Prt Sc will capture the currently selected window.[1] The captured image can then be pasted into an editing program such as a graphics program or even a word processor. Pressing Prt Sc with both the left Alt key and left ⇧ Shift pressed turns on a high contrast mode (this keyboard shortcut can be turned off by the user).[2] Since Windows 8, pressing the ⊞ Win key in combination with Prt Sc(and optionally in addition to the Alt key) will save the captured image to disk (the default pictures location).[3] This behavior is therefore backward compatible with users who learned Print Screen actions under operating systems such as MS-DOS.
Break key 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 E1hex 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.[1]