That expression returns .t. when nCht is odd (2,4,6...) and .f. when nCnt is even (1,3,5...) that way any odd memeber of listbox is selected. You can change that expression to .t. to have all members of listbox selected.
Against Stupidity the Gods themselves Contend in Vain - Johann Christoph Friedrich von Schiller
The only thing normal about database guys is their tables.