I feel very silly for asking this but I have just downloaded Fortran 90 and am trying to figure out how to open the command window. I am used to using MATLAB which automatically opens a command window when you open the program. I have the option of opening the developer studio or the command prompt. If I open the command prompt it says the following: Setting environment for using Visual Fortran tools C:\Documents and Settings\Owner> If I open the developer studio, I can write a program but I feel like I need to open a command window of some sort in order to run it. I am familiar with MATLAB but am very lost and don't even know how to start if I can't even open a command window to write a program or assign a variable. I have been searching on the internet and in the library and I think my question is so basic that the authors don't even bother to answer it. Any help would be much appreciated.