The function of <Ctrl>D is to indicate "End of Transmission". It is the ASCII EOT code. Some run-time libraries and unix shells can use it when reading from standard input to signal the end of the message.
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Assuming I understand your question: On an IBM PC keyboard there is a key labeled Ctrl which stands for Control. For a number of functions they will say Press Ctrl plus some other key. For example, Ctrl+C (sometimes written Ctrl-C) copies just like the copy function in the Edit menu. To copy using Ctrl+C, highlight the area you want to copy, press the Ctrl key and while holding it down, press the C key on the keyboard.
Ctrl+r
superscript
Magnify the information displayed on the screen.
Changes the font to "underscore".