This code is to filter a report, but it could be adapted to filter a form:
http://allenbrowne.com/ser-50.html
Another option would be to use a pop-up search form with five combo boxes
for selecting the five employees, then using those values as the criteria
for a query on which a form or report is based. If there could be fewer
than five employees you would need to allow for nulls.
In any case the table should not be opened and filtered directly. The
filtering (the selection of the five employees)should limit the record
source for a form or report.