[ASN.1] a doubt about IMPLICIT

[tong]

 Hi all
        Is IMPLICIT only mean that: When several Tags express a same parameter,then 
only use one tag to express the parameter?
Is this right?
and IMPLICIT don't have any affection on  conditions like this:
        A ::= SEQUENCE{
                B  INTEGER  
                }
        C A::={16}
the encode of C is:  30 03 02 01 10 ,and is not :02 01 10 ?