shift-command-D will update the current bookmark.

Ample/Base.lproj/MainMenu.xib

@@ -16,6 +16,7 @@
         <customObject id="rSq-qV-SGy" customClass="BookmarkManager">
             <connections>
                 <outlet property="menu" destination="ha0-nx-PIl" id="Ozd-ID-egK"/>
+                <outlet property="updateMenuItem" destination="30b-vT-HIa" id="AgZ-LE-no6"/>
             </connections>
         </customObject>
         <customObject id="Voe-Tx-rLC" customClass="AppDelegate">
@@ -416,6 +417,11 @@
                                     <action selector="addBookmark:" target="-1" id="cqp-ko-BfQ"/>
                                 </connections>
                             </menuItem>
+                            <menuItem title="Update Bookmark" keyEquivalent="D" id="30b-vT-HIa">
+                                <connections>
+                                    <action selector="updateBookmark:" target="-1" id="Au0-Sp-cUD"/>
+                                </connections>
+                            </menuItem>
                             <menuItem title="Set Default" hidden="YES" id="vbR-vS-lqO">
                                 <modifierMask key="keyEquivalentModifierMask"/>
                                 <connections>

Ample/BookmarkManager.h

@@ -10,6 +10,7 @@
 #import <CoreData/CoreData.h>
 
 @class NSMenu;
+@class NSMenuItem;
 @class Bookmark;
 @class DiskImage;
 
@@ -18,8 +19,11 @@ NS_ASSUME_NONNULL_BEGIN
 @interface BookmarkManager : NSObject
 
 @property (weak) IBOutlet NSMenu *menu;
+@property (weak) IBOutlet NSMenuItem *updateMenuItem;
 @property (readonly) NSManagedObjectContext *managedObjectContext;
 
+@property (nullable) Bookmark *currentBookmark;
+
 +(instancetype)sharedManager;
 
 -(NSString *)uniqueBookmarkName: (NSString *)name;
@@ -28,13 +32,13 @@ NS_ASSUME_NONNULL_BEGIN
 
 //-(NSError *)saveDefault: (NSDictionary *)bookmark;
 
+-(Bookmark *)defaultBookmark;
 -(NSDictionary *)loadDefault;
 
 -(NSError *)setAutomatic: (Bookmark *)bookmark;
 
 -(BOOL)addDiskImage: (NSObject *)pathOrURL;
 
-
 //-(void)convertLegacyBookmarks;
 @end
 

Ample/BookmarkManager.m

@@ -28,6 +28,8 @@
     NSArrayController *_items;
     NSUInteger _newMenuGeneration;
     NSUInteger _currentMenuGeneration;
+    
+    Bookmark *_currentBookmark;
 }
 
 @end
@@ -235,7 +237,8 @@ static BookmarkManager *singleton = nil;
 }
 
 
--(NSDictionary *)loadDefault {
+-(Bookmark *)defaultBookmark {
+
     NSFetchRequest *req;
     NSError *error;
     NSArray *array;
@@ -245,10 +248,12 @@ static BookmarkManager *singleton = nil;
     [req setPredicate: [NSPredicate predicateWithFormat: @"automatic == TRUE"]];
     array = [_moc executeFetchRequest: req error: &error];
 
-    b = [array firstObject];
-    
-    return [b dictionary];
+    return [array firstObject];
+}
 
+-(NSDictionary *)loadDefault {
+    Bookmark *b = [self defaultBookmark];
+    return [b dictionary];
 }
 
 /* save as .Default */
@@ -557,17 +562,37 @@ static NSString *kMenuContext = @"";
 {
 }
 
+-(Bookmark *)currentBookmark {
+    return _currentBookmark;
+}
+-(void)setCurrentBookmark:(Bookmark *)currentBookmark {
+    if (currentBookmark == _currentBookmark) return;
+    _currentBookmark = currentBookmark;
+    _newMenuGeneration++;
+}
+
 -(void)menuNeedsUpdate:(NSMenu *)menu {
     
     if (_currentMenuGeneration == _newMenuGeneration) return;
     _currentMenuGeneration = _newMenuGeneration;
+
+    if (_currentBookmark && _updateMenuItem) {
+        NSString *title = [NSString stringWithFormat: @"Update “%@”", [_currentBookmark name]];
+        [_updateMenuItem setHidden: NO];
+        [_updateMenuItem setTitle: title];
+        [_updateMenuItem setRepresentedObject: _currentBookmark];
+    } else {
+        [_updateMenuItem setHidden: YES];
+        [_updateMenuItem setRepresentedObject: nil];
+    }
+    
     
 
     NSArray *menus = [menu itemArray];
     for (NSMenuItem *item in [menus reverseObjectEnumerator]) {
         if ([item tag] == 0xdeadbeef) [_menu removeItem: item];
     }
-    
+
     NSArray *array = [_items arrangedObjects];
     for (Bookmark *b in array) {
 

Ample/LaunchWindowController.m

@@ -29,6 +29,7 @@ static NSString *kContextMachine = @"kContextMachine";
     BOOL _loadingBookmark;
     NSString *_machine;
     NSDictionary *_machineDescription;
+    BookmarkManager *_manager;
 }
 @property (strong) IBOutlet MediaViewController *mediaController;
 @property (strong) IBOutlet SlotViewController *slotController;
@@ -189,6 +190,8 @@ static int EffectsIndex(NSString *str) {
 
 -(void)windowWillLoad {
 
+    _manager = [BookmarkManager sharedManager];
+    
     // if this calls [self window], it will recurse.  that is bad.
     //[self defaultLoad: nil];
     [self reset];
@@ -731,6 +734,7 @@ static NSString *ShellQuote(NSString *s) {
 
 -(IBAction)resetAll:(id)sender {
 
+    [_manager setCurrentBookmark: nil];
     [self reset];
     [self resetSoftware];
     [_slotController resetSlots: sender];
@@ -779,37 +783,40 @@ static NSString *ShellQuote(NSString *s) {
 
 -(IBAction)defaultSave:(id)sender {
 
-    #if 0
-
-    BookmarkManager *bm = [BookmarkManager sharedManager];
-
+#if 0
     NSDictionary *d = [self makeBookmark];
 
-    [bm saveDefault: d];
+    [_manager saveDefault: d];
 #endif
 }
 
 -(IBAction)defaultLoad:(id)sender {
 
-    BookmarkManager *bm = [BookmarkManager sharedManager];
+    Bookmark *b = [_manager defaultBookmark];
 
-    NSDictionary *d = [bm loadDefault];
-    if (!d) {
+    if (!b) {
         [self resetAll: sender];
         [self setMachine: nil];
         [_machineViewController reset];
         [_slotController setMachine: nil];
         return;
     }
-    [self loadBookmark: d];
+    [self loadBookmark: b];
+}
+
+-(IBAction)updateBookmark: (id)sender {
+    
+    Bookmark *b = [sender representedObject];
+    if (!b) return;
+    
+    NSDictionary *d = [self makeBookmark];
+    [b setDictionary: d];
 }
 
 -(IBAction)addBookmark:(id)sender {
     
     if (!_machine) return;
 
-    BookmarkManager *bm = [BookmarkManager sharedManager];
-
     NSString *name = nil;
     if (_machineDescription) name = [_machineDescription objectForKey:@"description"];
     if (!name) name = _machine;
@@ -819,7 +826,7 @@ static NSString *ShellQuote(NSString *s) {
         name = [name stringByAppendingFormat: @" - %@", [_software title]];
     }
     
-    name = [bm uniqueBookmarkName: name];
+    name = [_manager uniqueBookmarkName: name];
     
     [self setBookmarkName: name];
     [self setBookmarkDefault: NO];
@@ -836,10 +843,9 @@ static NSString *ShellQuote(NSString *s) {
 
 -(IBAction)bookmarkSave:(id)sender {
         
-    BookmarkManager *bm = [BookmarkManager sharedManager];
 
 #if 0
-    if (![bm validateName: _bookmarkName]) {
+    if (![_manager validateName: _bookmarkName]) {
         [_bookmarkTextField selectText: nil];
         NSBeep();
         return;
@@ -849,7 +855,7 @@ static NSString *ShellQuote(NSString *s) {
     NSDictionary *d = [self makeBookmark];
     NSError *e;
     
-    if (( e = [bm saveBookmark: d name: _bookmarkName automatic: _bookmarkDefault])) {
+    if (( e = [_manager saveBookmark: d name: _bookmarkName automatic: _bookmarkDefault])) {
         // probably a duplicate name...
         [_bookmarkTextField selectText: nil];
         [_bookmarkErrorField setStringValue: [e localizedDescription]];
@@ -866,31 +872,24 @@ static NSString *ShellQuote(NSString *s) {
 -(void)bookmarkNotification: (NSNotification *)notification {
     
     Bookmark *b = [notification object];
-    NSDictionary *d = [b dictionary];
-    
-    [self loadBookmark: d];
+    [self loadBookmark: b];
 }
 
 -(IBAction)bookmarkMenu:(id)sender {
-    
-#if 0
-    NSURL *url = [sender representedObject];
-    if (!url) return;
-    
-    NSDictionary *d = [NSDictionary dictionaryWithContentsOfURL: url];
-    if (!d) return; // oops...
-    
-#endif
+
     // represented object is a Bookmark.
-    NSDictionary *d = [(Bookmark *)[sender representedObject] dictionary];
-    [self loadBookmark: d];
+    Bookmark *b = [sender representedObject];
+    [self loadBookmark: b];
 }
 
 
--(void)loadBookmark: (NSDictionary *)d {
+-(void)loadBookmark: (Bookmark *)b {
     Class StringClass = [NSString class];
     Class NumberClass = [NSNumber class];
-    
+
+    NSDictionary *d = [b dictionary];
+
+    [_manager setCurrentBookmark: b];
     
     NSString *machine = [d objectForKey: @"machine"];
     if (!machine) return;