4.2.1 Notation for Tutorial Instructions

Before we go any further, we will need a few notational conventions, so let us introduce some. We use underlined type for things that you will type. We use typewriter for labels and prompts, such as the prompt in the PDP++ shell or a label on a type-in menu boxes. bold is used to denote an object type name, like BpUnit. We use italic for menu items or buttons you will click on or select using the SELECT (usually left) mouse key. For multi-step menu selections we will use statements like 'select A/B/C'. This means that you should press and hold the select key on menu item A. When a popup menu appears move the pointer to item B. When a further popup menu appears, move the pointer to C, and then release the select key. Finally, we use double quotes to designate strings that name objects such as files, layers, units, etc.