I'd ask Why just as AJ has...
In any event this is not directly possible using any form of standard SQL query. The nearest Access could come to doing what you ask (which is in effect pivoting the list of applicants from rows to columns of your query) is via a Crosstab query, but this will not work for what you want to do as it would pivot all applicants for all posts into the column list, not just the applicants for the current post only.
It can be done in code by processing a recordset in a loop and generating a list of applicants for each post, but you'd need to have good VBA skills to do so.
-Stewart