Hi, first of all: thanks a lot for your answers! I have revised my PATH and now it is possible to do the following: write(*,*)'1' pause call system('clear') write(*,*)'2' pause end It works (Win-XP-shell)! ..but if I use: call system('cls') I get the following (new) message: cls: not found If I write the cls-command manually in the Win-XP-shell, it works. If my program tries to invoke the cls command in the Win-XP-shell it does not work? Thanks, Lars