[Zope-dev] Question

Hi all, If have a little Problem. Lets say if have a Product foo which is a Folder-like Object. Foo contains many Folders, all of these Folder Contain one or two File-Objects. Each folder in foo should be a Folder for a special User where the id of the folder is the name of the user. Are there any hooks in zope which are called, when a authenticated user opens a file from a any folder in foo. struct: foo/ john/ File1 melissa/ File1 joe/ File1 thanks as