Like any table type dataset, TTable lets you control read and write access by your application using the ReadOnly property. 

In addition, for Paradox, dBASE, and FoxPro tables, TTable can let you control read and write access to tables by other applications. The Exclusive property controls whether your application gains sole read/write access to a Paradox, dBASE, or FoxPro table. To gain sole read/write access for these table types, set the table component's Exclusive property to True before opening the table. If you succeed in opening a table for exclusive access, other applications cannot read data from or write data to the table. Your request for exclusive access is not honored if the table is already in use when you attempt to open it. 

The following statements open a table for exclusive access:

CustomersTable.Exclusive := True; {Set request for exclusive lock}
CustomersTable.Active := True; {Now open the table}

CustomersTable->Exclusive = true; // Set request for exclusive lock
CustomersTable->Active = true; // Now open the table