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To illustrate what I mean, if you had a page that read:

<%
Pi = 3.141592654
Response.Write Pi
%>
this is a perfectly valid page. You will get the value of Pi written back to the
page, as you really expected.
Now, using the Option Explicit directive as above, let’s rewrite the same page
as follows:
<%
Option Explicit
Pi = 3.141592654
%>
Now you have an error that says:
Microsoft VBScript runtime (0x800A01F4)
Variable is undefined: 'Pi'
/asp/test.asp, line 3
The reason is that, now, with the Option Explicit directive, IIS expects to see
a declaration of every variable that is used.
So, in this case, the correct script must read:
<%
Option Explicit
Dim Pi
Pi = 3.141592654
%>