In standard worksheet and workbook events, the Sub argument lists include
some "mysterious" argument components, such as: ByVal Target As Range, Cancel
As Boolean, ByVal Sh As Object, etc.

The VBA Help states that ByVal (and ByRef) can be used with Call only when
calling a DLL procedure !!

a. Do standard / custom events automatically call a DLL procedure, and thus
their argumentlist must include ByVal ??

b. Are Target, Cancel, Sh, Wn, etc. Keyword variable names ??

c. Can one use, for example, the variable name Target in the procedure ??
after assigning an object reference to it: Set Target = ??

d. If Target is not used or can not be used, can one omit Target As Range
from the argumentlist ??

Thank you.