I found that the parameters mentioned in help file are very incomplete. For example, FTPRush does have some ones such as "RushApp.UI.Selection.TargetFtpName", "RushApp.UI.Selection.IsLeftSide" and "RushApp.UI.Selection.TargetFtpPath", but I never found them in the help file.
For my specified uses, I need more parameters to build my script, but I can only guess whether this parameter exists, or search in the Internet (I'd say there're little clues about it, only several articles). It will be appreciated if a detailed document about it is available.
Never mind. I suddenly found there're a popup menu to fill parameters.. It has a little delay thus I never notice that before. Anyway, still wish a complete doc, thanks again.