As Alain suggested, refer to the user guide. 

1. To retrieve all contact ID's, fetch the entire list of contacts, and 
iterate through them as demonstrated here. Rather than building the contact 
URL yourself like you did there, I think you can use something like 
contact.getEditLink().getHref() instead
http://code.google.com/apis/contacts/docs/3.0/developers_guide.html#retrieving_without_query

2. This is more of a Java question. You'll probably want to submit the 
contact URL or ID from the client to the DeleteContact servlet via HTTP. The 
easiest way to do this depends on how your current DeleteButton click action 
is wired up/intended to work. Is your delete button submitting an HTML form? 
Does it trigger some javascript function? Is it actually a link?

Vinay

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