An important note or instruction.

A warning about possible errors or important notes that require special attention.

Anti-virus network

A new term or an emphasis on a term in descriptions.

<IP-address>

Placeholders.

Save

Names of buttons, windows, menu items and other program interface elements.

ctrl

Names of keyboard keys.

/Volumes/Macintosh HD/

Names of files and folders, code examples.

Appendix A

Cross-references to document chapters or internal hyperlinks to webpages.