With LGF you can create DLLs for use with different language systems. Console I/O in the Fortran code is not recommended in Windows GUI applications, but just about everything else that is supported under Windows will work. Calls can be made from Fortran to Fortran, from Fortran to another language, and from another language to Fortran. Note that issuing a STOP statement from within a Fortran DLL will cause the entire program to terminate. If you are calling DLL procedures from a language system other than LGF, please refer to that language system's DLL documentation for more information.