Question:
Where are the VK_Key constants A-Z and 0-9 declared?
Answer:
They are not declared in Delphi, since they are simply the
ordinal value for those keys.
VK_0 thru VK_9 are the same as ASCII '0' thru '9' ($30 - $39)
VK_A thru VK_Z are the same as ASCII 'A' thru 'Z' ($41 - $5A).