A Windows terminal emulator application is a very expensive piece of code. They are very sophisticated programs and a lot of effort has gone into developing them. We are talking about applications that can convert the communication between your modern and fluid personal computer into something with which an old ‘dumb’ mainframe computer can communicate. Before the advent of personal computers and user-friendly operating systems, terminals were used to access and modify the data on mainframe computers. That meant you were using a screen and a keyboard, and you had to be writing code. Now, we use operating systems like Windows 8 and Apple Lion OSX. What we now do with a single click of a mouse used to take many lines of code. The emulator emulates one of those old terminals. So you can imagine what the application has to do every time you do something on the application, which looks like any other application, on your desktop.