(eXternal FunCtioN) A user-developed HyperCard function that is written in a language, such as C or Pascal. XFCNs usually return a value. See XCMD and function.
"XFCN." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/xfcn>.
XFCN. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/xfcn
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