HEy i Hope this is the right place for this but its been driving me mad how this works.

I am working with a company that want to amke a wiki site there outgoing website. I would assume that this is possiable however i need to have a few things on it.

1 The abulity to lock content. so when a topic is started we can lock the writing at the top and just have content below. Also that would be the same when people add so other user cant take it away.

2 Some pages can be editied by anyone and others by members. (if that make sense)

3 THey do not have a server so just need the software if that is possiable.

Thanks in advance for all your help