SAVE
saves the active model's data needed for later resuming or loading in a next working session. This command will save the model data in a binary format that can be loaded with the RESUME command. This command requires the model information to be specified before use.
Note: The format of the binary data in Prep not compatible with the SASSI User Interface. Transferring models between the two interface requires a Pre file which can be obtained using the WRITE command.