problem with overlap is multipath. If signals reach the receiver at different times the signal will be degraded, not strengthened.
You can do file sharing but you'd better do a lot of planning beforehand. Limits on the number of users per network segment will be your issue.
Yes, you can limit bandwidth...you need to read up on configuration and planning of networks. Nobody here is bothered by questions, however most of us sleep sometimes...it's now 7AM where I am<yawn>
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