The initial value of this variable is nil, which indicates that lisp always uppercases strings that are used for topic and item names. This will suffice in most cases since most applications that implement a DDE interface will accept any mixture of upper and lowercase characters in these topic and item names. But if you need to pass lower or mixed case names to a DDE server or client, then you can set this variable to non-nil.
Keep in mind that when symbols rather than strings are used in lisp for topic and item names, these symbols may (depending on the case mode of the running lisp) correspond to uppercase strings. So passing the topic :foo to another application may pass "FOO" rather than "Foo" or "foo", and if *case-sensitive-dde* is non-nil then the lisp DDE server will require its :system topic to be passed by a client as "SYSTEM" rather than "System".
See About DDE support in cgide.htm.
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.