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Technically, only the second technique might be called patching, since it’s applying a repair to an existing file without replacing it.
The term is, however, typically extended to include patching a product installation by replacing individual files without reinstalling a new version of the application.
However, it is easily installed and left on a computer by even once visiting a website that happens to use it.
In addition, a BIOS typically has a user interface of some sort that is accessible (only) at power-on; this allows many of the configuration options for the computer to be selected before any operating system is loaded.
The BIOS is typically stored in re-programmable ROM, allowing it to be updated using special reprogramming or “flashing” software (this is unrelated to so-called “flash memory” as used in USB memory sticks and other devices).
Historically, communications ports, printer ports, and other types of external ports on a computer have all been used.
In reality it is not four independently confirmed sources, but rather a single source published, or “echoed”, three or more additional times.