The 'secret' which Piggy entrusted to Ralph was that at school he had been nicknamed Piggy. Once he tells Ralph and Ralph later reveals this to the rest of the boys the nickname is used whenever he is referred to and his real name is never actually revealed.
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Piggy tells Ralph to blow the conch long and loud as they arrive at Castle Rock. It is an ineffective action because both boys know that none of the painted savages will follow Ralph anymore...
this were i got my answer http://www.enotes.com/lord-of-the-flies/q-and-a/although-totally-ineffective-what-does-piggy-urge-41621
Piggy is Ralph's best ally but he does not stand up for Piggy.
he keeps on saying piggy piggy and he lets jack and the other know his name and they teases him about it
Ralph wants to get Piggy's specs back and Piggy wanted to kill Jack there and then.
Ralph and Piggy use a conch shell to call the boys together.
Ralph admired Piggy only in the end, once he wept for him. He admired him for remaining civilized and intellectual. Otherwise, it was Piggy who admired Ralph. Hope this helped!