At this moment, all Monte Carlo models are initialised (via the RunMC GUI) for fully inclusive events (AROMA- for charm events). You can change this if you will include your Monte Carlo settings into the files located in ``proj/ini''. You have to use FORTRAN coding for this. Please refer to Monte Carlo manuals on how to specify your new Monte Carlo settings (they are in ``main/mcarlo/'' directories. The names of the subroutines in ``proj/ini'' are self-explanatory. The subroutine ``set-lepto-ariadne.f'' corresponds to LEPTO with ARIADNE (for ep DIS only!). When you did this,go to the ``proj'' directory and recompile it by typing ``make''. Note: PYTHIA does not work well for DIS, use it for photoproduction.
Another way to change MC parameters is to use steering cards (i.e initialisation files). Examples of the steering cards are located in ``example/steer/'' directory. Copy necessary steering card to a directory were you run RunMC GUI (i.e. where you execute ``runmc''). The steering cards will be included automatically. Note that in the parameters settings, the functions in ``proj/ini'' directory are always the last one, i.e. parameters in steering cards can be overwritten by the settings in ``proj/ini functions.
The steering cards can be loaded and edited using RunMC steering card editor. Use ``Settings- Steering card''. You should see a spreadsheet-type of editor for the steeringcards, where you can type new parameters for MC models. Note: you loaded RMC file, which may contain some steering cards, it is important to start RunMC from the ``proj'' directory, otherwise the RunMC steering-card editor will never find the current RMC steering card.
Note that the steering card for HERWIG is still rather simple, i.e. only a few parameters were implemented so far. Look at the ``main/mcarlo/herwig-65/RUNMC-herwig.steer.f'' to check which parameters can be included. Therefore, the best way to change the HERWIG parameters is to use more flexible function in ``proj/ini''.