Found Good docs - Revisiting Pike

I'm currently studying the pike manual/chapter_5.html#5.5 Indexing

A sample quote:

Function     Syntax    Ident	 Returns

Index       a [ b ]    `[]       Returns the index b from a.=20

Safe Index  a [? b ]   none      Returns the index b from a, returning 0 i=
nstead
                                 of an error of a is 0

Lookup	    a ->ident  `->	Looks up the identifier. Same as
                                a["ident"].

I don't understand the `[] and `-> syntax. I need some simple examples of =
usage.
Also a ->ident aka a["ident"] escapes me. What is meant by "Ident" i.e.
"Identifier"?

TIA !
=2D-=20
Duke