Hmmm....didn't work, but...
This does:
=DCount("EmployeeID","1A_All Employees","Depart_DNO between #10/1/02# and #10/31/02#")
The expression...
=DCount("[EmployeeID]","1A_All Employees","[Depart_DNO] Between #09/30/02# And #11/01/02#,0)
returns an error, stating that a string can only be 255...