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diff --git a/src/dk.biks.bachelorizer/dk/biks/bachelorizer/Main.java b/src/dk.biks.bachelorizer/dk/biks/bachelorizer/Main.java
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+// SPDX-FileCopyrightText: 2025 Jonas Smedegaard <dr@jones.dk>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package dk.biks.bachelorizer;
+
+import java.lang.UnsupportedOperationException;
+import java.util.Arrays;
+
+/* TODO
+import dk.biks.bachelorizer.view.Oneshot;
+import dk.biks.bachelorizer.view.Prompt;
+import dk.biks.bachelorizer.view.Pipe;
+import dk.biks.bachelorizer.view.Screen;
+*/
+import dk.biks.bachelorizer.view.Window;
+
+/// Bachelorizer - bachelor programme registrar
+///
+/// Tool for registering students
+/// for activities in their bachelor programme.
+///
+/// Runner class spawning an interactive or non-interactive application
+/// based on passed arguments
+///
+/// Multi-framework MVC structure inspired by project Криптоанализатор
+/// written by Александр Хмелев <akhmelev@gmail.com>.
+///
+/// * v0.0.1-draft
+///   * initial release, as part of delivery "Portfolio 1"
+///
+/// @version 0.0.1-draft
+/// @see <https://moodle.ruc.dk/mod/assign/view.php?id=523186>
+/// @see <https://github.com/demologin/CryptoAnalyzerLed>
+public class Main {
+
+	/// Default constructor
+	///
+	/// @param args  command-line arguments or default demo data
+	public Main(final String[] args) {
+
+		switch (uiFromArgs(args)) {
+			case "gui" -> { Window.main(args); }
+// TODO			case "tui" -> { Screen.main(args); }
+// TODO			case "cli" -> { Line.main(args); }
+			default -> {
+				throw new UnsupportedOperationException(
+					"Not yet implemented.");
+			}
+		}
+	}
+
+	/// JVM entry point
+	///
+	/// @param args  command-line arguments
+	public static void main(String[] args) {
+
+		// inject initial sample data unless passed as arguments
+		if ((args.length == 0)
+			|| (!Arrays.stream(args).anyMatch(
+				s -> s != null && !s.startsWith("-")))
+		) {
+			args = new String[] {
+				"Jonas Smedegaard",
+				"CS-SMC2",
+				"CS-SMC3",
+			};
+		}
+
+		new Main(args);
+	}
+
+	/// minimal argument parser to detect explicit UI choice
+	///
+	/// @param args  command-line arguments
+	/// @return      choice of UI as String
+	public static String uiFromArgs(String[] args) {
+		// TODO: make "cli" the default when implemented
+		String defaultUI = "gui";
+
+		for (String arg : args) {
+			if (arg.matches("--(gui|tui|cli)")) {
+				return (arg.length() == 2)
+					? defaultUI
+					: arg.substring(2);
+			}
+		}
+
+		return defaultUI;
+	}
+}