You define dialog boxes by entering DCL descriptions in ASCII text files, much like writing AutoLISP code. DCL files have a .dcl extension. A single DCL file can contain the description of one or more dialog boxes, or it can contain only prototype tiles and subassemblies for use by other DCL files. A DCL file consists of the following three parts, which can appear in any order. Depending on your application, only one or more of these parts is required.

• References to other DCL files

  These consist of include directives as described in Referencing DCL Files.

• Prototype tile and subassembly definitions

  These are tile definitions you can refer to in subsequent tile definitions (including dialog box definitions).

• Dialog box definitions

  These define the attributes of tiles or override the attributes defined in prototype tiles and subassemblies.