Arguments: stream object
Returns t if object is a valid graphics-context for stream, and nil otherwise. Currently returns t for any windows-graphics stream with any graphics-context object, but in the future different kinds of stream may require different graphics-contexts.
See copy-graphics-context (where all the information in a graphics-context object is described), make-graphics-context, set-graphics-context, and restoring-graphics-context.
Common Graphics and IDE documentation is described in About Common Graphics and IDE documentation in cgide.htm.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.