> I would like to know can we do the same without longitude and latitude, just
> using the Address and postcode?

Yes, but it might be a dumb idea.  Geocoding many address entries from
a database to turn them into lat/longs of each visit of people to your
page - is dumb.   Geocode once and store.
http://code.google.com/apis/maps/articles/phpsqlgeocode.html

> I saw some samples from google - but the user needs to trigger an action to
> view the markers.

Yes, they are samples.  It's up to you write code that behaves
differently for a real apllication.

> so my question is can we use the API in such a way that even if there is no
> latitude and longitude - can we list all markers at a time in the map, just
> using the address and postcode?

Maps require lat/long.  Tools to convert address to lat/long exist.

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