## 3.4. Autodyn Modules (Non-Parameter Data)

If you need data in addition to that supplied as formal parameters to a user subroutine, you can usually get this data directly from the Autodyn modules, which follow the naming conventions *.mod. The Autodyn modules for Autodyn-2D and Autodyn-3D are described in Autodyn User Subroutine Modules. To use a particular module in a user subroutine insert the statement:

    	USE  xxxxxx

where `xxxxxx` is the name of the appropriate module.

The dummy subroutines have USE statements already defined for the most often required global data. Also, the comments indicate which variables in these modules are likely to be of use.

Caution: Be extremely careful if you modify variables other than the user variables (VAR01 through VAR20), and that the modified values are consistent with the use of the variables. Global variables are used by other routines and assigning bad values to them could cause Autodyn to terminate unexpectedly.

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