What is the meaning of the value of the bScan 0x45 parameter in keybd_event?

Many examples use keybd_event , have a value of 0x45 for bScan parameter.

What is the meaning of this 0x45 value?

I had the impression 0x45 was a scancode keyboard , but since it is used for a different number of keys, I'm not so sure about that.

My goal is to use keybd_eventeither from .NET P / Invoke or from Delphi, and make the types more restrictive (using, for example, enums or flag enums) so that my code is simplified.