What it means
In every Australian state and territory, a valid formal will must generally be signed by the will-maker in the presence of two witnesses, who then sign in the will-maker's presence. Australian wills are witnessed, not notarised. A witness should be independent: in most jurisdictions a beneficiary (or their spouse) who witnesses the will may lose their gift unless an exception applies. Witnesses should be over 18 and able to see the will-maker sign.
How it's used
Two neighbours acted as witnesses to the will, signing it immediately after watching her sign.