Dear Mr.Richard,
Um very glad for contacting you and really want your help in very small issue
I have 2 tables
EmployeesTable and contains:
EmpID
Fname
Lname
UserName
Password
and the other table is MainPage and contains:
EmpID
Employee Name
ProjectID
WorkItems
Description
Date
Hours

I have 2 forms as well , The first one is the login page which have username and password
And the other is the main Page and contains all the MainTable contents
Now i have several users are accessing the MainPage but i want to control users to ONLY insert records in his fields not another user
for example:
UserName: R.Jhon
Password: R.Jhon123

when R.jhon login to the MainPage it should select automatically His ID and don't let him to change it , So that he only can use the form as data entry for his profile only .
Really need this help URGENTLY :) .

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Reply from Alex Hedley:

The Security Seminars shows exactly this.