The number of the column or TableBlob.

Column and TableBlob controls
PocketBuilder dot notation:
dw_control.Object.controlname.ID
Describe and Modify argument:
"controlname.ID"
Parameter  | 
Description  | 
|---|---|
controlname  | 
The name of the column or TableBlob for which you want the ID number  | 
setting = dw_1.Object.empname.ID
setting = dw_1.Describe("empname.ID")