Context: Several subsets of Unicode are standardized: Microsoft Windows since Windows NT 4.0 supports WGL-4 with 652 characters, which is considered to support all contemporary European languages using the Latin, Greek, or Cyrillic script. Other standardized subsets of Unicode include the Multilingual European Subsets: MES-1 (Latin scripts only, 335 characters), MES-2 (Latin, Greek and Cyrillic 1062 characters) and MES-3A & MES-3B (two larger subsets, not shown here). Note that MES-2 includes every character in MES-1 and WGL-4.

Question: What subset of Unicode is used by Windows? 
Answer: WGL-4 with 652 characters

Question: What are MES-1, MES-2, AND MES-3A AND MES-3B part of? 
Answer: Multilingual European Subsets

Question: What subset includes every character in MES-1 and WGL-4? 
Answer: MES-2

Question: How long has Microsoft Windows supported WGL-4? 
Answer: since Windows NT 4.0

Question: MES-1 uses what scripts only? 
Answer: Latin scripts only

Question: What system uses MES-3A?
Answer: Unanswerable

Question: How many Latin characters are supported in WGL-4?
Answer: Unanswerable

Question: How many characters are in MES-3B?
Answer: Unanswerable

Question: MES-3A combines which two other sets?
Answer: Unanswerable

Question: What subset only uses the Greek script?
Answer: Unanswerable