[Zope] VHM limits?

Hi all, I have some questions, before i make some thousands (really!) VMH mappings to my server because I dont want to shut-out my zope loveliness... 1/ how much virtual servers could have single VHM mapping, or it have some size limit (eg., 64kB) 2/ it si possible to have multiple VHM objests in zope root (ie., one per set, for example vhm_A, vhm_B, vhm_C...) 3/ it is possible to place VHM objects into some folderish object (ie., Folder, Transparent Folder) for better organisation? Many thanks, JL.