Cuatro’s square root

This crossword clue is for the definition: Cuatro’s square root.
it’s A 20 letters crossword puzzle definition.
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Possible Answers: DOS.

Last seen on: USA Today Crossword – Sep 16 2020

Random information on the term “DOS”:

Arachne is a discontinued Internet suite containing a graphical web browser, email client, and dialer. Originally, Arachne was developed by Michal Polák under his xChaos label, a name he later changed into Arachne Labs. It was written in C and compiled using Borland C++ 3.1. Arachne has since been released under the GPL as Arachne GPL.

Arachne primarily runs on DOS-based operating systems, but includes builds for Linux as well. The Linux version relies on SVGALib and therefore does not require a display server.

Arachne supports many file formats, protocols and standards including video modes from CGA 640×200 in monochrome to VESA 1024×768 in high color mode (65536 colors). It is designed for systems that do not have any windowing systems installed.

Arachne supports multiple image formats including JPEG, PNG, BMP and animated GIF. It supports a subset of the HTML 4.0 and CSS 1.0 standards, including full support for tables and frames. Supported protocols include FTP, NNTP for USENET forums, POP3, SMTP and Gopher. Arachne includes a full-fledged TCP/IP connection suite, which has support for some dial-up and Ethernet connections. However, Arachne has no support for JavaScript, Java or SSL. Arachne can be expanded with the use of add-ons for such tasks as watching DivX movies, playing MP3 files, IRC chat, RSS and viewing PDF documents. Arachne also supports DOS Gateway Interface (DGI), a unique feature similar to Common Gateway Interface (CGI) scripting on the client.

DOS on Wikipedia