This help system documents the FlexDCA application that powers the N1000A DCA-X, 86100D DCA-X, N109x and N107x-series DCA-M modules, and N1010A FlexDCA software on a PC. FlexDCA includes the Graphical User Interface for these products, which is documented in this help, and the remote control SCPI interface which is documented in the FlexDCA Programmer's Guide help.