NLSInfo.exe, a free Windows Server 2003 Resource Kit tool, is a command-line tool that displays information about the locale settings for a computer.

When I open a CMD.EXE windows on my Windows XP workstation and type NLSInfo, I receive:

Host Name:                    JSI009
System Default UI Language:   English (United States)
System Locale:                English (United States)
User Locale:                  English (United States)
Input Locale:                 English (United States)
Windows Code Page:            437   (OEM - United States)
Console Code Page:            437   (OEM - United States)
Number Format:                123,456,789.00
Currency Format:              $123,456,789.00
Time Format:                  HH:mm:ss
Short Date Format:            MM/dd/yyyy
Long Date Format:             dddd, MMMM dd, yyyy
Time Zone:                    (GMT-05:00) Eastern Standard Time
Daylight Saving Changes:      Enabled
Installed Keyboards:
          English (United States)
Installed Code Pages:
          10000 (MAC - Roman),
          10006 (MAC - Greek I),
          10007 (MAC - Cyrillic),
          10010 (MAC - Romania),
          10017 (MAC - Ukraine),
          10029 (MAC - Latin II),
          10079 (MAC - Icelandic),
          10081 (MAC - Turkish),
          10082 (MAC - Croatia),
          1026  (IBM EBCDIC - Turkish (Latin-5)),
          1250  (ANSI - Central Europe),
          1251  (ANSI - Cyrillic),
          1252  (ANSI - Latin I),
          1253  (ANSI - Greek),
          1254  (ANSI - Turkish),
          1255  (ANSI - Hebrew),
          1256  (ANSI - Arabic),
          1257  (ANSI - Baltic),
          1258  (ANSI/OEM - Viet Nam),
          20127 (US-ASCII),
          20261 (T.61),
          20866 (Russian - KOI8),
          21866 (Ukrainian - KOI8-U),
          28591 (ISO 8859-1 Latin I),
          28592 (ISO 8859-2 Central Europe),
          28594 (ISO 8859-4 Baltic),
          28595 (ISO 8859-5 Cyrillic),
          28597 (ISO 8859-7 Greek),
          28599 (ISO 8859-9 Latin 5),
          28605 (ISO 8859-15 Latin 9),
          37    (IBM EBCDIC - U.S./Canada),
          437   (OEM - United States),
          500   (IBM EBCDIC - International),
          737   (OEM - Greek 437G),
          775   (OEM - Baltic),
          850   (OEM - Multilingual Latin I),
          852   (OEM - Latin II),
          855   (OEM - Cyrillic),
          857   (OEM - Turkish),
          860   (OEM - Portuguese),
          861   (OEM - Icelandic),
          863   (OEM - Canadian French),
          865   (OEM - Nordic),
          866   (OEM - Russian),
          869   (OEM - Modern Greek),
          874   (ANSI/OEM - Thai),
          875   (IBM EBCDIC - Modern Greek),
          932   (ANSI/OEM - Japanese Shift-JIS),
          936   (ANSI/OEM - Simplified Chinese GBK),
          949   (ANSI/OEM - Korean),
          950   (ANSI/OEM - Traditional Chinese Big5),
          65000 (UTF-7),
          65001 (UTF-8)