diff --git a/vite/src/pipedal/FilePropertyDialog.tsx b/vite/src/pipedal/FilePropertyDialog.tsx
index cda47c8..8ecb77e 100644
--- a/vite/src/pipedal/FilePropertyDialog.tsx
+++ b/vite/src/pipedal/FilePropertyDialog.tsx
@@ -1129,6 +1129,28 @@ export default withStyles(
 
         }
 
+        handleT3kLinkClick(href: string): boolean {
+            if (!href.startsWith("https://tone3000.com/")) {
+                return false;
+            }
+            return false;
+            // STUB: Waiting for a way to do a popup flow starting with a tone or user home page.
+            // let uri = new URL(href);
+            // if (uri.pathname.split("/").filter(segment => segment.length > 0).length === 1) {
+            //     // It's a username. Launch a select flow with username as a filter.
+            //     let username = uri.pathname.split("/").filter(segment => segment.length > 0)[0];
+            //     this.model.showTone3000DownloadPopup(
+            //         Tone3000DownloadType.Nam,
+            //         this.state.currentDirectory,
+            //         {
+            //             username: username
+            //         }
+            //     );
+            // }
+            
+            return true;
+        }
+
         render() {
             const isTracksDirectory = this.isTracksDirectory();
             const isToobNamModelFile = this.props.fileProperty.patchProperty === ToobNamModelFileUrl;
@@ -1803,6 +1825,9 @@ export default withStyles(
                             <TextInfoDialog open={true}
                                 title={pathFileNameOnly(this.state.textFileName)}
                                 fileName={this.state.textFileName} onClose={() => this.setState({ textFileName: undefined })}
+                                onT3kLinkClick={(href) => {
+                                    return this.handleT3kLinkClick(href); }
+                                }
                             />
                         )}
                     </DialogEx>
diff --git a/vite/src/pipedal/PiPedalModel.tsx b/vite/src/pipedal/PiPedalModel.tsx
index bc2868f..d75a631 100644
--- a/vite/src/pipedal/PiPedalModel.tsx
+++ b/vite/src/pipedal/PiPedalModel.tsx
@@ -773,7 +773,10 @@ export class PiPedalModel //implements PiPedalModel
 
     showTone3000DownloadPopup(
         downloadType: Tone3000DownloadType,
-        downloadPath: string
+        downloadPath: string,
+        options?:  {
+            userName?: string;
+        }
     ): void {
         if (this.tone3000DownloadHandler === null) {
             this.tone3000DownloadHandler = new Tone3000DownloadHandler(this);
@@ -781,7 +784,7 @@ export class PiPedalModel //implements PiPedalModel
         this.tone3000DownloadHandler.launchTone3000Popup(
             downloadType,
             downloadPath,
-        );
+            options);
 
     };
 
@@ -1375,6 +1378,7 @@ export class PiPedalModel //implements PiPedalModel
             }
             this.debug = !!data.debug;
             let { socket_server_port, socket_server_address, max_upload_size } = data;
+
             if ((!socket_server_address) || socket_server_address === "*") {
                 socket_server_address = window.location.hostname;
             }
diff --git a/vite/src/pipedal/TextInfo_RewriteT3kUrls.ts b/vite/src/pipedal/TextInfo_RewriteT3kUrls.ts
new file mode 100644
index 0000000..029ae57
--- /dev/null
+++ b/vite/src/pipedal/TextInfo_RewriteT3kUrls.ts
@@ -0,0 +1,102 @@
+/*
+ *   Copyright (c) 2026 Robin E. R. Davies
+ *   All rights reserved.
+
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ 
+ *   The above copyright notice and this permission notice shall be included in all
+ *   copies or substantial portions of the Software.
+ 
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *   SOFTWARE.
+ */
+
+import type { Root } from 'hast';
+
+// Rewrite <a> tags with "t3klink?id=xxx" hrefs to call the T3kLinkHandler handler instead of navigating to a new page.
+
+// // Hook in the rewriter as follows:
+//                             <ReactMarkdown   urlTransform={urlTransform} rehypePlugins={
+//                                     [
+//                                         [remarkGfm],
+//                                         [rehypeRaw],
+//                                         [rehypeSanitize, extendedSchema],
+//                                         [rehypeExternalLinks, {target: '_blank'}]
+//                                         [rewriteT3kUrls, {...options}]
+//                                     ]}>
+//                                     {this.state.textFileContent}
+//                                 </ReactMarkdown>
+
+type HastNode = {
+	type: string;
+	tagName?: string;
+	properties?: Record<string, unknown>;
+	children?: HastNode[];
+};
+
+export type T3kLinkClickHandler = (href: string) => boolean;
+
+export interface RewriteT3kUrlsOptions {
+	prefixUrl?: string;
+	onT3kLinkClick?: T3kLinkClickHandler;
+}
+
+// Default callback. Supply `onT3kLinkClick` in options to handle links.
+export function T3kLinkHandler(href: string): boolean {
+	void href;
+	return false;
+}
+
+
+function getHref(properties: Record<string, unknown>): string | null {
+	const href = properties.href;
+	return typeof href === 'string' ? href : null;
+}
+
+function rewriteNode(node: HastNode, prefixUrl: string, onT3kLinkClick: T3kLinkClickHandler): void {
+	if (node.type === 'element' && node.tagName === 'a') {
+		const properties = node.properties ?? {};
+		const href = getHref(properties);
+		if (href && href.startsWith(prefixUrl)) {
+			properties.target = '_blank';
+			properties.rel = 'noopener noreferrer';
+			properties.onClick = (event: { preventDefault?: () => void; stopPropagation?: () => void; }) => {
+				const handled = onT3kLinkClick(href);
+				if (handled) {
+					event.preventDefault?.();
+					event.stopPropagation?.();
+				}
+			};
+			node.properties = properties;
+		}
+	}
+
+	if (node.children) {
+		for (const child of node.children) {
+			rewriteNode(child, prefixUrl, onT3kLinkClick);
+		}
+	}
+}
+
+
+export function rewriteT3kUrls(options?: RewriteT3kUrlsOptions) {
+	const prefixUrl = options?.prefixUrl;
+	const onT3kLinkClick = options?.onT3kLinkClick ?? ((href: string) => T3kLinkHandler(href));
+	return (tree: Root) => {
+		if (!prefixUrl) {
+			return;
+		}
+		rewriteNode(tree as unknown as HastNode, prefixUrl, onT3kLinkClick);
+	};
+}
+