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1. Generate a debuggable version of your recognizer by specifying the -debug option to ANTLR
2. Create a driver program that creates your recognizer and runs some test input through it (see the examples-v3 archive for sample driver programs)
3. Compile your driver and recognizer to produce your executable file(s)
4. Execute your driver program (it will launch your recognizer and appear to hang - it's just waiting for ANTLRWorks to connect)
5. Start ANTLRWorks (or switch to it if it is already running) and click the menu Debugger|Debug Remote...
6. Click Connect to accept the default host and port values (localhost and 49153 respectively)
7. ANTLRWorks should now start debugging your recognizer!

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