Gets the value of the first element in a group. The first element in the group is the element with the lowest value. You can follow this function with a GrpNext() call, to get the value of all the elements in a group.
The group handle, returned from the GrpOpen() function. The group handle identifies the table where all data on the associated group is stored.
The value of the first element in a group or -1 if the group is empty.
IF Value<>-1 THEN
Prompt("First value is "+Value:###);