This appendix describes interfaces that are of interest to FormsVBT programmers.
The ColorName interface describes the names that are permitted in FormsVBT color-expressions, e.g., (BgColor "VividTomato"). While these names are useful to all FormsVBT programmers, the procedures in the interface will be useful primarily to VBTkit programmers.
The XTrestle interface provides utility procedures for handling the display and geometry command-line parameters that use the X server.
You should use use XParam interface instead of XTrestle if your application installs more than one top-level window.
The FVTypes interface provides the type definitions of the VBT classes implementing each FormsVBT component. Clients that override the realize method will need to access this interface.
The Rsrc interface describes how constant data (texts, pixmaps, form-descriptions, etc.) can be combined with a program.