The Control keys in Formula

The control key may be used to do several commands. You have to press simultaneously the Ctrl key plus a usual  character key.

Here are the commands you get:

Ctrl + "end" key: move the cursor to the end of the formula
Ctrl + "home" key: move the cursor at the beginning of the formula
Ctrl + PgUp: move the cursor to the beginning of the document.
Ctrl + PgDn: move the cursor to the end of the document.

Ctrl + a: display the fonts menu allowing you to change
permanently the current font.
Ctrl + b: display the fonts menu allowing you to change temporarily (just for the next character) the current font.
Ctrl + c: copy the selection into the clipboard.
Ctrl + d: enter the subscript mode: this will put the
next character in index. To enter permanently in subscript mode use Tab + d ; to go back use the Enter key.
Ctrl + f: open the Search & Replace window.
Ctrl + g: change temporarily the current font for the greek font.
Ctrl + j: change temporarily the current font for the mathematic2 font.
Ctrl + l: change temporarily the current font for the user font.
Ctrl + m: change temporarily the current font for the mathematic font.
Ctrl + p: change the formula to a line formula.
Ctrl + q: ask to save changes and quit PreTeX.
Ctrl + r: put a bar over the next character.
Ctrl + s: save the document on the hard disc.
Ctrl + t: preview the document.
Ctrl + u: enter the superscript mode: this will put
the next character in exponent. To  enter permanently in superscript mode use Tab + u ; to go back  use the Enter key.
Ctrl + y:  display the shapes font menu allowing you to change temporarily the current shape of the font.
Ctrl + z: display the shapes font menu allowing you to change permanently the current shape of the font.