diff --git a/darwin/app_kit.nim b/darwin/app_kit.nim
index b04dfa6..24d8a1b 100644
--- a/darwin/app_kit.nim
+++ b/darwin/app_kit.nim
@@ -3,11 +3,11 @@ import app_kit / [nsscreen, nsview, nsevent, nscursor, nspasteboard, nswindow,
     nsapplication, nsmenu, nsresponder, nstext, nstextview, nswindowcontroller,
     nsdragoperation, nsdragginginfo, nsalert, nsimage, nscell, nscontrol,
     nsfont, nstextfield, nscolor, nsimageview, nspanel, nssavepanel,
-    nsopenpanel, nsbutton]
+    nsopenpanel, nsbutton, nseventmask]
 export foundation, nsscreen, nsview, nsevent, nscursor, nspasteboard, nswindow,
     nsapplication, nsmenu, nsresponder, nstext, nstextview, nswindowcontroller,
     nsdragoperation, nsdragginginfo, nsalert, nsimage, nscell, nscontrol,
         nsfont, nstextfield, nscolor, nsimageview, nspanel, nssavepanel,
-            nsopenpanel, nsbutton
+            nsopenpanel, nsbutton, nseventmask
 
 {.passL: "-framework AppKit".}
diff --git a/darwin/app_kit/nsapplication.nim b/darwin/app_kit/nsapplication.nim
index 4cc42b3..feeb548 100644
--- a/darwin/app_kit/nsapplication.nim
+++ b/darwin/app_kit/nsapplication.nim
@@ -59,4 +59,6 @@ proc stopModal*(self: NSApplication) {.objc: "stopModal".}
 # Abort a specific modal session
 proc abortModal*(self: NSApplication) {.objc: "abortModal".}
 
-proc setDelegate*(s: NSApplication, d: NSObject) {.objc: "setDelegate:".}
\ No newline at end of file
+proc setDelegate*(s: NSApplication, d: NSObject) {.objc: "setDelegate:".}
+
+proc sendAction*(s: NSApplication, a: SEL, to: ID, `from`: ID): BOOL {.objc: "sendAction:to:from:".}
\ No newline at end of file
diff --git a/darwin/app_kit/nsevent.nim b/darwin/app_kit/nsevent.nim
index deff3e3..3bff7af 100644
--- a/darwin/app_kit/nsevent.nim
+++ b/darwin/app_kit/nsevent.nim
@@ -1,6 +1,7 @@
-import ../objc/runtime
+import ../objc/[runtime, blocks]
 import ../core_graphics/cggeometry
 import ../foundation/[nsgeometry, nsstring, nsdate]
+import ./nseventmask
 
 type
     NSEvent* = ptr object of NSObject
@@ -86,3 +87,4 @@ proc mouseEventWithType*(self: typedesc[NSEvent], eventType: NSEventKind, locati
                          buttonNumber: NSInteger, clickCount: NSInteger, pressure: CGFloat): NSEvent {.objc: "mouseEventWithType:location:modifierFlags:timestamp:windowNumber:buttonNumber:clickCount:pressure:".}
 
 proc charactersIgnoringModifiers*(self: NSEvent): NSString {.objc: "charactersIgnoringModifiers".}
+proc addLocalMonitorForEventsMatchingMask*(self: typedesc[NSEvent], mask: NSEventMask, handler: Block[proc (e: NSEvent): NSEvent]):ID {.objc: "addLocalMonitorForEventsMatchingMask:handler:", discardable.}
diff --git a/darwin/app_kit/nseventmask.nim b/darwin/app_kit/nseventmask.nim
new file mode 100644
index 0000000..2aa02c1
--- /dev/null
+++ b/darwin/app_kit/nseventmask.nim
@@ -0,0 +1,18 @@
+type
+  NSEventMask* {.size: sizeof(uint64).} = enum
+    LeftMouseDown       = 1 shl 1,
+    LeftMouseUp         = 1 shl 2,
+    RightMouseDown      = 1 shl 3,
+    RightMouseUp        = 1 shl 4,
+    MouseMoved          = 1 shl 5,
+    LeftMouseDragged    = 1 shl 6,
+    RightMouseDragged   = 1 shl 7,
+    KeyDown             = 1 shl 10,
+    KeyUp               = 1 shl 11,
+    FlagsChanged        = 1 shl 12,
+    ScrollWheel         = 1 shl 22,
+    TabletPoint         = 1 shl 23,
+    TabletProximity     = 1 shl 24,
+    OtherMouseDown      = 1 shl 25,
+    OtherMouseUp        = 1 shl 26,
+    OtherMouseDragged   = 1 shl 27