The keyboard shortcut for adding a bookmark in Safari or Firefox is Command (⌘) - D.
[Ctrl] -------> [V]
command - v
Command A = Select All
CTRL hold it and press P
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The pro tools 8 keyboard shortcut for setting punch markers is Command+Shift+P.
ctrl+i is the keyboard shortcut of the Italic button.
An on-screen note that provides the name of the command, available keyboard shortcut(s), a descripton of the command, and sometimes instructions for how to obtain help about the command.
Pressing F8 will start selection mode in Excel.
There is no keyboard shortcut key to delete a column, nor is there any special command. The quickest way to delete the contents of a column is to click on the letter at the top of the column you want to delete and press the Del key.
That may vary from one program to another. It may also vary according to the language. Often it is Ctrl-A, but for a specific program (and language), just look for the "Select All" command in the menu - the shortcut key is usually displayed next to the command.