TZF - Topaz -network comments ideas

 Dear Group
I would appreciate any next step ideas (or user experience) on networking
an topaz/delphi application. I am familiar with network terms but still
learning.

My application is within a medical office and currently I use a peer to peer
network with a shared database of patient info, that resides on one
computer.
I have 2 users and this works ok. It is essentially a .exe file that is
loaded on both computers but both link to the .dbf files in  one  common
directory .

I would like to expand to include a new user, in another  building (300-400
meters away).
Any comments on what works well , access speed is a big issue.
I have win xp (pro) as  my one computer and a lap top that currently
networks (peer to peer) in.
Can I (easily ) add the third user if both sites  have internet access. Is
this done the ' best' with a server? or with max of 3-4 users can I use my
current machine (xp pro) as a terminal and a server. I'm I going to hit big
problems sticking with topaz.

I appreciate this is a complex question, but looking for some direction and
identification of bottlenecks ,as to easiest and cost saving..( I realize
these can be exclusive cost and easy...)

Thanks for any direction
Roger

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