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Oracle Database Centralization Problem

I have developed a new database system by using ‘Oracle 10g’ version. I created the forms by using ‘Oracle Developer Suite’, too. I used a personal database in a PC existing at a LAN in a company having a domain. I use the following link to login my system:
http://ComputerName:8889/forms/f90servlet

1. Is there any way to make the personal database as SHARED DATABASE so other workstations can connect it using the LAN?
2. Do other workstations need ‘Oracle Developer Suite’ installation to access the System in the mentioned PC?
3. What’s the best way to make a centralized Oracle system fully web-based on a LAN (Please, specify server type and required software and configurations)?
Please, explain the answer for the entire previous questions in details

I hope that you deliver the full answer and I really appreciated.

Thanks for cooperation, too.