Text that refers to elements of the user interface is in bold, e.g. Main window.
Menu1>Item1 means: click on Menu1 in the menu bar and select Item1.
Text that the user can type is shown in a non-proportional font.
Text that refers to keyboard keys is in italics. E.g. the keyboard accelerator for Insert>
Single Guest is 
+G, which means hold down the Key and press the G key.
Hyperlinks are shown in conventional hyperlink format.
Underline is used for emphasis.
'Click' means clicking the left mouse button, unless stated otherwise. If you have a single button mouse you can simulate right click by holding down the key and clicking the left mouse button.