Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

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In this formula

=VLOOKUP(C1,$A$1:$B$100,2,

C1 is the "lookup value" and that is always searched for in the first column of the "table array" $A$1:$B$100, so the first column is $A$1:$A$100. C1 is searched for in that range and the formula returns a value from the column designated by the "column index" - 2 in the above formula - so that's the second column of $A$1:$B$100, so if C1 matches A14 then the formula returns B14.

The zero at the end (or you can use FALSE) designates an "exact match", so C1 has to exactly match a value in $A$1:$A$100.

If C1 doesn't match any value in $A$1:$A$100 the formula returns #N/A

Excel help also explains VLOOKUP quite well......

regards, barry