Important characters in Prolog:

Prolog uses some characters outside the normal alphanumeric character set. You should find out where these are on the keyboard you regularly use. The following is a list of the characters you are most likely to need:

Character	Prolog name
    !        Cut
    |        Vertical bar or list constructor

    /        Slash

    \        Back slash

    _        Under_score (not to be confused with the minus sign)

    [ ]      Square brackets

You may need to know where the escape key is in order to be able to use an editor. This key is usually labelled with <ESC>.