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+%D \module
+%D   [       file=spec-win,
+%D        version=1996.01.25,
+%D          title=\CONTEXT\ Special Macros,
+%D       subtitle=\YandY's \DVIWINDO,
+%D         author=Hans Hagen,
+%D           date=\currentdate,
+%D      copyright={PRAGMA / Hans Hagen \& Ton Otten}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+\unprotect
+
+%D Remark: chained references are not yet implemented.
+
+%D \macros
+%D   {dosetupinteraction,
+%D    dostartthisislocation,
+%D    dostartthisisrealpage,
+%D    dostartgotolocation,
+%D    dostartgotorealpage,
+%D    dostartrunprogram,
+%D    usepagedestinations}
+%D   {}
+%D
+%D As told before, these were the first interactive specials.
+%D In those days, these kind of specials were still elegant
+%D and straightforward.
+
+\startspecials[dviwindo]
+
+\definespecial\dosetupinteraction%
+  {\showmessage\m!interactions{21}{dviwindo}}
+
+\definespecial\dostartgotolocation#1#2#3#4#5#6%
+  {\bgroup
+   \doifelsenothing{#3}
+     {\doifelsenothing{#4}
+        {\!!doneafalse}
+        {\doifparentfileelse{#4}
+           {\!!doneafalse}
+           {\!!doneatrue}}%
+      \setreferencefilename#4\to\DVIfile
+      \scratchdimen#1\edef\width {\the\scratchdimen\space}%
+      \scratchdimen#2\edef\height{\the\scratchdimen\space}%
+      \special
+        {button:
+           \width \height
+           \if!!donea
+             file: \DVIfile,
+           \fi
+           "#5"}}
+     {}% nog uri afhandelen
+   \egroup}
+
+\definespecial\dostartgotorealpage#1#2#3#4#5%
+  {\bgroup
+   \doifelsenothing{#3}
+     {\doifelsenothing{#4}
+        {\!!doneafalse}
+        {\doifparentfileelse{#4}
+           {\!!doneafalse}
+           {\!!doneatrue}}%
+      \setreferencefilename#4\to\DVIfile
+      \scratchdimen#1\edef\width {\the\scratchdimen\space}%
+      \scratchdimen#2\edef\height{\the\scratchdimen\space}%
+      \special
+        {button:
+           \width \height
+           \if!!donea
+             file: \DVIfile,
+           \fi
+           \ifnum0#5=0 \else
+             page: #5
+           \fi}}
+     {}% nog uri afhandelen
+   \egroup}
+
+\definespecial\dostartthisislocation#1%
+  {\special{mark: "#1"}}
+
+\definespecial\dostartthisisrealpage#1%
+  {}
+
+\definespecial\dostartrunprogram#1#2#3#4%
+  {\bgroup
+   \scratchdimen#1\edef\width {\the\scratchdimen\space}%
+   \scratchdimen#2\edef\height{\the\scratchdimen\space}%
+   \special{button: \width \height launch: #3 #4}%
+   \egroup}
+
+\let\doyandyinsertmov = \docommoninsertmov
+\let\dotrinsertmov    = \docommoninsertmov
+
+\stopspecials
+
+\protect \endinput