Load a dialog definition file.
This function loads a DCL dialog control language file. DCL files must be loaded before IntelliCAD® 2001 can display a custom dialog box.
The filename argument is the name of the DCL file.
The key argument is a system name for the dialog box, which is used by the key argument in other DLG functions.
This function returns the RTNORM or RTERROR.
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Programming Overview of SDS™ (Solutions Development System™)