- 62 -17.28. SysModificationUpdates the BHT system program.For a description of all members of this class, refer to section “18.28. SysModification".¾Syntax[VB]Public Class SysModification[C#]public class SysModification¾NamespaceDNWA.BHTCL¾AssemblyDNWA.BHT400CL.dll