Gaussian Architecture

• Gaussian 98 is a connected system of programs for performing a variety of semiempirical, density functional theory and ab initio calculations

• It consists of more than 4000 subroutines organized into programs which communicate through disk files. Each subprogram is a link. Links are organized in overlays.

  - Overlay 0 is responsible to start the program, including reading the input file.
  
  - Once the route card is read, the proper set of overlays/options/links is selected for a particular run.
  - Overlay 99 (L9999) terminates the run.

• Currently one source code supports all versions

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