There are many functions on your PC, the origin of which you never thought, or thought, but were afraid to ask. I think it's time to teach you a small lesson in computer history, and you, after many years, can thank the creators of important functions as Cut, Copy, Paste and combinations Ctrl+Alt+Del.
Copy-Paste
Each of us probably cannot imagine a personal computer without a copy of copying, inserting and cutting out an unnecessary fragment. They have become an integral part of our life, and not only computer. Today, we boldly call stolen posts by the newly formed term “copy -paste”.
Before the computer era, when people still had the opportunity to edit manuscripts manually, there was an uncomplicated operation - “Cut and Paste”. The literal translation tells us about the essence of the editor’s work: part of the page with a fragment of the text was literally cut out (CUT) and glued (Paste) to the right place on another page. In 1974, an employee of the Xerox Larry Tesler company, engaged in the development of a text editor for the GINN and Company, reduced the number of copying operations and created CUT-PASTE and Copy-Paste. It is believed that this is how the foundation of modern journalism was laid.
In 1981, Apple released the first PC with a graphic interface - Lisa, where the Copy operation was responsible for the Copy, for Paste - V, for CUT - X.

Ctrl + Alt + Del
This combination is known to all of us as a great way of interrupting no applications, restarts or even entering Windows. Who stood at the origins of the creation of this sudden combination, which so loved users of personal computers? David Bradley - the developer of the original IBM PC - has implemented the computer rebooting the “in the absence of a response to requests” in the CTRL+ALT+DEL functions. They say that for a long time he “rebooted” the computer every now and then to choose a convenient combination of keys. The original was Ctrl+Del+ESC, but he considered it inconvenient for pressing with one hand. So a combination with the Del key was invented.

Bradley in one interview said: "I may have invented Ctrl+Alt+Del, but Bill [Gates] made him famous."