Terminal emulator is simply a windowed shell; this is known as “command line window” in some other environments. If you want to use the shell, you should know at least a few of the system-level commands for your operating system.
A small application that occupies very little memory and screen space, and at the same time gives you some useful information or provides a control shortcut. For instance the Clock applet shows current time and date (and even a month diary if you click it), and System Monitor applet shows how busy your machine currently is in real-time.
An X-window application which was not written with KDE in mind. Such applications run fine in KDE. However, they are not warned automatically when you shut down your KDE session. You therefore must not forget to save documents open in these applications before you log out from KDE.
Additionally, many of these applications do not support copying and pasting from KDE compliant applications. Netscape® 4.x browser is a prominent example of such application [1].
Application originally written for non-graphic, text oriented environment. Such applications run fine in KDE. They must run within console emulator, like Konsole. They are not warned automatically when you shut down your KDE session. You therefore must not forget to save documents open in these applications before you log out from the KDE.
Console applications support copying and pasting from KDE-compliant applications.Simply mark the text in the console application with your mouse, switch to the KDE-compliant application and press Ctrl+V to paste the text. If you want to copy from KDE application to a console application, first mark the text with your mouse, press Ctrl+C, switch to the console application and press the middle button on your mouse[2].
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