
The Checkbox Source page allows the source of the checked-unchecked logic for the checkbox to be specified by pushing one of the Check Source radio buttons.
The available options are:
Fixed - the state of the checkbox and may be set using the checkbox on the source page.
Database field - the state is taken from the contents of the specified field of the current database, and leads to a checked box if the database field contains a value other than 0 (empty counts as 0)..
Synthesised - the state is set when required using a formula which leads to a checked box if the formula evaluates to a value other than 0 (see the Synthesiser Wizard for details).
More: