VBScript の定数、文字列の定数

everyday VBScript 
MsgBox "vbCr: "          & Asc(vbCr)
MsgBox "vbCrLf: "        & Asc(vbCrLf)
MsgBox "vbFormFeed: "    & Asc(vbFormFeed)
MsgBox "vbLf: "          & Asc(vbLf)
MsgBox "vbNewLine: "     & Asc(vbNewLine)
MsgBox "vbNullChar: "    & Asc(vbNullChar)
'MsgBox "vbNullString: "  & Asc(vbNullString)
MsgBox "vbTab: "         & Asc(vbTab)
MsgBox "vbVerticalTab: " & Asc(vbVerticalTab)