decis execut committe septemb set ad hoc committe greec sch rev execut committe regard articl convent implement schengen agreement agreement access hellen republ convent implement schengen convent partial brought forc decis octob decid ad hoc committe set examin greec fulfil precondit abolit check person intern border contract parti particip send expert committe committe task gather inform area check extern border applic common manual surveil extern land sea border visa applic common consular instruct condit govern movement alien includ measur regard illeg immigr alien illeg schengen territori resid permit alert purpos refus entri polic cooper mutual assist crimin matter includ extradit drug si applic siren manual protect person data polici expuls readmiss arrang movement person airport committe evalu result inquiri area extern border check arrang movement person airport area make observ committe draft report summari inform gather evalu observ submiss group frontier central group basi report execut committe adopt decis meet decemb accord decis execut committe octob adopt vienna königswint septemb chairman kanther