A way to do that is to use the function called systemqq in the MSFLIB (or DFLIB in some cases). By example

program XXX

use msflib

character(len=3)       :: command
logical                :: result

command = 'dir'
result = systemqq (command)

end program XXX

will execute the dir command.

Actually,  there is no standard way of executing a DOS command or any other program executable from within a Fortran program.   The Fortran standard does not attempt to address such issues as they are dependant on the hardware and operating system and compiler being used.

However...  I doubt that there are any F90 compilers that can't do these things.  The   "CALL SYSTEM(  )"  command is a fairly common extension used by many compiler vendors.   You'll have to look in your compilers documentation to be sure how to do it correctly.   People here can only guess and tell you what their particular compiler can do.

Dan   
www.dtware.com