Every form object is assigned a unique ID to allow other dependent objects such as the XProgress object to keep track of the current status of an upload. You can change the unique ID at any time before the upload starts (this typically occurs when the item collection is first referenced).

Once the upload has started the form object keeps track of the current status of the upload and enters the information into the upload database. The upload database is publicly available and so other objects can obtain information as long as they know the appropriate ID.

IDs are generally random numbers and must range between 1 and 2,147,483,647.

XProgress object.