Advocates enrolled in one High Court can practice and file cases in other High Courts across India. However, to file a petition in a High Court outside their home state, they must do so alongside an advocate registered and practising in that specific court. While they can register and file directly in their home High Court, understanding each court's unique rules and regulations is essential. Key governing laws include the High Court Act, the Advocates Act, and Bar Council regulations, with Supreme Court judgments also providing guidance.