Once you have created and loaded the external functions they will be available with any simulation you make including simulations from a Venapp. If you are using External Functions for an application you are distributing using the Vensim Redistribution kit or the Vensim Application Runtime you should include the external function library in the same directory as the model and use the Venapp command SETTING>EXTERNALFUNCTION|dllname.dll. The Vensim Application Runtime is also named Vensim.exe (or Vensimdp.exe) so the same DLL library will work without modification.
