Document \\.\COM10 faff on Windows.

References:
<http://msdn2.microsoft.com/en-us/library/aa363858.aspx> (CreateFile() docs)
  describes the use of \\.\
<http://msdn2.microsoft.com/en-us/library/aa365247.aspx> ("Naming a File")
  lists the reserved filenames (COM1-COM9, LPT1-LPT9, CON, PRN, AUX, NUL)

git-svn-id: svn://svn.tartarus.org/sgt/putty@7208 cda61777-01e9-0310-a592-d414129be87e

diff --git a/doc/config.but b/doc/config.but
index 63aac0a..2925957 100644 (file)
--- a/doc/config.but
+++ b/doc/config.but
@@ -2975,8 +2975,10 @@ The \q{Serial line to connect to} box allows you to choose which
 serial line you want PuTTY to talk to, if your computer has more
 than one serial port.
 
-On Windows, the first serial line is called \cw{COM1}, and if there
-is a second it is called \cw{COM2}, and so on.
+On Windows, the first serial line is called \i\cw{COM1}, and if there
+is a second it is called \cw{COM2}, and so on. A serial line with
+a name other than \cw{COM1} to \cw{COM9} can be specified by prefixing
+its name with \cw{\\\\.\\} - for instance, \cw{\\\\.\\COM10}.
 
 This configuration setting is also visible on the Session panel,
 where it replaces the \q{Host Name} box (see \k{config-hostname}) if