Genero Desktop Client front calls This section describes GDC specific front calls. GDC Monitor Front Calls This section describes front calls specific to the GDC monitor. Windows DDE Support Description of Windows™ DDE support. Windows COM Support "COM" stands for Component Object Model. It allows anyone to directly access Windows™ Applications Objects. You can create instances of those objects, call methods on them, and get or set their properties. Windows Mail extension Description of the Windows™ Mail extension.