iTrigger refers to an Inventor user parameter that you can include in the current document to fire rules manually. This parameter is frequently used to launch a dialog box from a rule. The dialog box provides a custom interface to define design parameters.
The iTrigger command creates an Inventor user parameter named iTrigger0 in the document being edited. If the parameter exists in the document, the command increases the value of this parameter by 1 and fires any rules containing the iTrigger0 parameter.
After you use the iTrigger command to create the iTrigger0 parameter, add the following line in a rule to fire it when the command is used again:
trigger = iTrigger0