ATLAST(<C character>, <C string>)
 Evaluates rightmost postition of a character in a string.
 Returns <expN> position of the last occurrence of <character> in <string>.

 If LEN(<character>) is greater than 1, only the first character is
 looked at.

 ATLAST( "a", "AAABBaCdda" ) returns 10
 ATLAST( "b", "AAABBaCdda" ) returns  0
 ATLAST( "A", "AAABBaCdda" ) returns  3
 ATLAST( "C", "AAABBaCdda" ) returns  7


             Placed in the Public Domain by Tom Rettig Assoc.