A question about "esp"

From: dongmonkey1 (spamtrap_at_crayne.org)
Date: 09/06/04 

Date: Mon, 6 Sep 2004 02:28:46 +0000 (UTC)

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add esp,4
pop esp
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this will pop [esp+4] or pop [esp]?
and if pop [esp+4], whether former [esp] still in stack?