Twilight Development System (TDS) provides an integrated environment for writing and compiling source files like Turbo Pascal or Borland C/C++. The main program of the package is a powerful text editor called Twilight Editor (Ted) which includes an integrated project manager. This project manager simplifies and speeds up the development of programs composed of different source files (modules). With TDS it's possible to compile and link these modules into an executable file with a single command and if the compiler finds some errors, they will be reported directly by the editor. TDS doesn't provide its own compiler, but can use any compiler or assembler callable from Shell. It can interface directly with many common compilers and assemblers like DICE C, SAS C, Lattice C, Aztec C, DevPac, A68k, PCQ, HCC, GNU-C, Amiga-E, Oberon and even programs like TeX, CatComp and MakeInfo. If the compiler is not supported, it's possible to write a little interface program to convert the error messages in a format readable by the editor. The compile process will be executed concurrently using another program called Twilight Make (TMake), so the user can continue to edit the source files while the compiler is working. To install TDS you can use the 'Installer' program from Commodore. To start the installation process simply double-click the icon called 'Install TDS' and follow the instructions. The installation script will modify your 'user-startup' to include an assignment to the directory containing the programs which will be called 'TDS:'. You have also the choice to install some example project files which will help you in building your own project files. If you don't have the 'Installer' program, then you can manually install the software creating a directory and copying there all files. Finally add an 'assign TDS: ' to the 'user-startup'.