I want to write a Module file. Can I do that with out writing the user interface part?
Yes. The UI's that AMX writes for their modules is to give you a starting point for working with the COMM modules. Also gives you the flexibility of changing channel codes.
If you haven?t already seen these yet, here are two tech notes with module source code example zip files that you may want to check out:
Tech Note 271: Module Example
Tech Note 375 How to Write Your Own Netlinx Modules