Simultaneous connections for a user

Hello,
I'm working a project, which involves having a single user to query, the user of the database would be used by many users (without them having an account), ie all would use this account to make inquiries ..
I had not had a problem like this and so I come to see, how many simultaneous connections a user can have and if you can change the maximum number of simultaneous connections. Since on average the database would receive between 2000 and 3000 queries per minute and it seems a little overloaded for a single user.
You might want to have more users for this?
You can use this option to increase the number of simultaneous connections?
I use Oracle 11g Express
Of course I am very grateful for the help and response.
Greetings.

This is what APEX is built for, AskTom.oracle.com does this daily.
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