multiple and single indexes with multiple arguments:
{{#indexentry:Animation, options|Options, animation}}
{{#indexentry:Animation, external loop}}

single index single argument:
{{#indexentry:+k}}

single index multiple argument
{{#indexentry:Clock, ini-option}}
{{#indexentry:Animation, internal loop}}

some are embedded in html structures:
<td><code>+KFI</code>n</td>{{#indexentry:+kfi}}
<td><code>+KFF</code>n</td>{{#indexentry:+kff}}
<td><code>+KI</code>n.n</td>{{#indexentry:+ki}}

grrrrr ... there are also tag elements inside tags:
{{#indexentry:#local|local}}
{{#indexentry:#if|#else|#elseif|#end}}

some additional interesting cases:
{{#indexentry:Options, height and width|Resolution}}

notes:
- indicies delimited by the vertical bar
- most index entries for one tag is 4
- arguments in indexes delimited by the comma
- called them arguments but maybe the comma's should get
  gobbled up as part of the link text
- screenshot investigation shows that comma's are indeed
  argument delimiters
