Well, you can do that by inserting a script, but radio buttons do that with no script involved. If you want to do it with checkboxes, here is the script (to be placed in the click event). You'd need to give the checkboxes unique names and you'd need a script for each of the other boxes. So for 3 boxes:
if (this.rawValue == 1) { //this stands for current checkbox
formName.subformName.CheckBoxName1.rawValue = 0 // clear checkbox
}
if (this.rawValue == 1) { //this stands for current checkbox
formName.subformName.CheckBoxName2.rawValue = 0 // clear checkbox
}
Regards,
Dave