What type of cipher takes one character and replaces it with one character, working one character at a time

What computer network component allows data transfers from one computer to another through a telephone line?

When you collaborate or meet with a person or group online, it is called

Hyperactive media sales has 10 windows 7 laptop computers used by sales-people in the organization. each laptop computer has several customized applications that are used during the sales process as well as customer relationship management software. all of the applications on the laptops are difficult to configure and have large data files. if all of the laptops have current hardware, what is the easiest way to install windows 10 on them?