Path to the external data processor file.
Form name as specified in the designer.
If the parameter is not specified, the main form is used.
A form that will be the owner of the opened form. If the parameter is not specified, the main form (according to the designer setting) is used.
This parameter can be used to set a key with a value that will be used for searching forms that have already been opened. If a form has the same uniqueness key, the found form will be activated instead of a new form being opened.
If this parameter is not specified, the already opened form will be searched first.
Undefined - if the form creation cancel flag is set in the OnCreateAtServer handler.