Remove mentionings of DOS.

Doc/api/init.tex

@@ -233,7 +233,7 @@
   environment variables.  The returned string consists of a series of
   directory names separated by a platform dependent delimiter
   character.  The delimiter character is \character{:} on \UNIX,
-  \character{;} on DOS/Windows, and \character{\e n} (the \ASCII{}
+  \character{;} on Windows, and \character{\e n} (the \ASCII{}
   newline character) on Macintosh.  The returned string points into
   static storage; the caller should not modify its value.  The value
   is available to Python code as the list

Doc/doc/doc.tex

@@ -927,8 +927,8 @@ This \UNIX\ is also followed by a space.
     \begin{macrodesc}{program}{\p{name}}
       The name of an executable program.  This may differ from the
       file name for the executable for some platforms.  In particular, 
-      the \file{.exe} (or other) extension should be omitted for DOS
-      and Windows programs.
+      the \file{.exe} (or other) extension should be omitted for 
+      Windows programs.
     \end{macrodesc}
 
     \begin{macrodesc}{programopt}{\p{option}}

Doc/lib/libos.tex

@@ -64,7 +64,7 @@ function.
 \begin{datadesc}{name}
 The name of the operating system dependent module imported.  The
 following names have currently been registered: \code{'posix'},
-\code{'nt'}, \code{'dos'}, \code{'mac'}, \code{'os2'}, \code{'ce'},
+\code{'nt'}, \code{'mac'}, \code{'os2'}, \code{'ce'},
 \code{'java'}, \code{'riscos'}.
 \end{datadesc}
 
@@ -1444,14 +1444,14 @@ parse or concatenate pathnames --- use \function{os.path.split()} and
 \begin{datadesc}{altsep}
 An alternative character used by the operating system to separate pathname
 components, or \code{None} if only one separator character exists.  This is
-set to \character{/} on DOS and Windows systems where \code{sep} is a
+set to \character{/} on Windows systems where \code{sep} is a
 backslash.
 \end{datadesc}
 
 \begin{datadesc}{pathsep}
 The character conventionally used by the operating system to separate
 search patch components (as in \envvar{PATH}), such as \character{:} for
-\POSIX{} or \character{;} for DOS and Windows.
+\POSIX{} or \character{;} for Windows.
 \end{datadesc}
 
 \begin{datadesc}{defpath}
@@ -1464,5 +1464,5 @@ key.
 The string used to separate (or, rather, terminate) lines on the
 current platform.  This may be a single character, such as \code{'\e
 n'} for \POSIX{} or \code{'\e r'} for Mac OS, or multiple characters,
-for example, \code{'\e r\e n'} for DOS and Windows.
+for example, \code{'\e r\e n'} for Windows.
 \end{datadesc}

Doc/lib/libundoc.tex

@@ -46,9 +46,6 @@ and are not documented beyond this mention.  There's little need to
 document these.
 
 \begin{description}
-\item[\module{dospath}]
---- Implementation of \module{os.path} on MS-DOS.
-
 \item[\module{ntpath}]
 --- Implementation on \module{os.path} on Win32, Win64, WinCE, and
 OS/2 platforms.

Doc/lib/libuu.tex

@@ -14,7 +14,7 @@ is also accepted, and the corresponding file will be opened for
 reading and writing; the pathname \code{'-'} is understood to mean the
 standard input or output.  However, this interface is deprecated; it's
 better for the caller to open the file itself, and be sure that, when
-required, the mode is \code{'rb'} or \code{'wb'} on Windows or DOS.
+required, the mode is \code{'rb'} or \code{'wb'} on Windows.
 
 This code was contributed by Lance Ellinghouse, and modified by Jack
 Jansen.

Doc/ref/ref2.tex

@@ -56,7 +56,7 @@ by following the explicit or implicit \emph{line joining} rules.
 
 A physical line ends in whatever the current platform's convention is
 for terminating lines.  On \UNIX, this is the \ASCII{} LF (linefeed)
-character.  On DOS/Windows, it is the \ASCII{} sequence CR LF (return
+character.  On Windows, it is the \ASCII{} sequence CR LF (return
 followed by linefeed).  On Macintosh, it is the \ASCII{} CR (return)
 character.
 

Doc/tut/tut.tex

@@ -176,7 +176,7 @@ your local Python guru or system administrator.  (E.g.,
 \file{/usr/local/python} is a popular alternative location.)
 
 Typing an end-of-file character (\kbd{Control-D} on \UNIX,
-\kbd{Control-Z} on DOS or Windows) at the primary prompt causes the
+\kbd{Control-Z} on Windows) at the primary prompt causes the
 interpreter to exit with a zero exit status.  If that doesn't work,
 you can exit the interpreter by typing the following commands:
 \samp{import sys; sys.exit()}.