Multiuser App/Form

Hi,

I need to design a ms access database (Office 2000),
that will according to some data enter by the user,
will create a "sql string" which will be send to a sql server.

I have a code that can get the User Name, it will be use as part of me sql
string.

sqlString = "Update tc_time Set user_name = ' " & dhGetUserName & " ',
user_date = " & now() & ", user_hours = " & UH & ", user_proj = " & Project
& ";"

The problem is that I don't want to create a database for each user (around
50),
each of them will open the app from its own computer,
and everybody will try to do it at the same time (before leaving the
office).

I can create a table where I can store the "sql string" with a column that
will have the user NetName (dhGetUserName).
So I can store/retrieved to send it to the sql server.
but what about my combo boxes which will be use by the employees to select
Department, Project, etc, etc.

I have never design something that will be use for so many people, and at
the same time.

Any suggestion, directions will be appreciated.

Regards,

Bre-x