Master Add-In 97 - Version 3.0 Master Add-In 97 is a code database add-in, prefilled with over one hundred subroutines. Code is inserted into your Visual Basic 4.0 (32-bit version only) project by a double-click within the Code-Listbox. The application provides a Subroutine Editor, Winsock Code Module (for direct communication with the Winsock.DLL), and Single Document Interface Template with a coolbar and API statusbar (uses no OCX files).