Relationship between CHR alt Alt-XXX on the numeric keypad
 

I was wondering if anybody could clear up a little problem for me?

I've been trying to produce some tables of all the extended characters
avaulable in any given typeface.

I've created a table with two columns, the left column formatted in
WindDings (although it could be any font), the right in Arial. I uses this
code to populate it:

Sub ControlChars()

Dim ControlCount As Integer

Range("J1").Select
For ControlCount = 1 To 255
Selection.Value = Chr(ControlCount)
Selection.Offset(0, 1).Value = "CHR(" & ControlCount & ")"
Selection.Offset(1, 0).Select
Next

End Sub

This works fine, but, when I also know that I can use ALT+XXX (with the
numeric keypad on) to enter extended characters, too.

Using 24 as an example, my generated table f shows, for CHR(24) an upward
pointing arrow. If I type in Alt-024. i get an upward pointing arrow. If,
however, I type Alt-24 (without the zero), I get a black circle with a "6" in
it!

Can anyone explain the relationship (if there is one) between CHR,
ALT+numbers preceded by a zero and ALT+numbers without a zero?

I realise this is more of a Windows thing, than an Excel thing, but if
anyone can help, I'd be very grateful.

Regards

Pete