diff --git a/lib/RELEASE-NOTES b/lib/RELEASE-NOTES
index 262edd92e4..9da7d8cec1 100644
--- a/lib/RELEASE-NOTES
+++ b/lib/RELEASE-NOTES
@@ -69,6 +69,8 @@
 
 * export-cancel: Used to cancel background export processes.
 
+* master-buffer-forall executes an lfun in the master and all children of a document.
+
 * paragraph-select is a new convenience function to select the paragraph
   surrounding the actual cursor position.
 
diff --git a/src/FuncCode.h b/src/FuncCode.h
index e94a7873ac..10d65b3e59 100644
--- a/src/FuncCode.h
+++ b/src/FuncCode.h
@@ -488,6 +488,7 @@ enum FuncCode
 	LFUN_BIDI,
 	// 380
 	LFUN_BUFFER_RESET_EXPORT,       // spitz 20191226
+	LFUN_MASTER_BUFFER_FORALL,      // spitz 20191231
 	LFUN_LASTACTION                 // end of the table
 };
 
diff --git a/src/LyXAction.cpp b/src/LyXAction.cpp
index 410d0f6ae5..aa57112776 100644
--- a/src/LyXAction.cpp
+++ b/src/LyXAction.cpp
@@ -2587,6 +2587,26 @@ void LyXAction::init()
  * \endvar
  */
 		{ LFUN_MASTER_BUFFER_EXPORT, "master-buffer-export", ReadOnly, Buffer },
+		
+/*!
+ * \var lyx::FuncCode lyx::LFUN_MASTER_BUFFER_FORALL
+ * \li Action: Applies a command to a buffer and all it children, starting from the master.
+ * \li Syntax: master-buffer-forall <LFUN-COMMAND>
+ * \li Params: <LFUN-COMMAND>: The command to be applied to the buffers.
+ * \li Sample: Close all Notes in buffers: \n
+	       master-buffer-forall inset-forall Note inset-toggle close \n
+	       Toggle change tracking on buffers: \n
+	       master-buffer-forall changes-track \n
+	       Toggle read-only for buffers: \n
+	       master-buffer-forall buffer-toggle-read-only \n
+	       Show statistics for individual buffers: \n
+	       master-buffer-forall statistics \n
+	       Activate the branch named "Solutions" in buffers: \n
+	       master-buffer-forall branch-activate Solutions \n
+ * \li Origin: spitz, 31 Dec 2019
+ * \endvar
+ */
+		{ LFUN_MASTER_BUFFER_FORALL, "master-buffer-forall", ReadOnly | Argument, Buffer },
 
 /*!
  * \var lyx::FuncCode lyx::LFUN_MASTER_BUFFER_UPDATE
diff --git a/src/frontends/qt/GuiView.cpp b/src/frontends/qt/GuiView.cpp
index 32d6d9334f..a7839114b9 100644
--- a/src/frontends/qt/GuiView.cpp
+++ b/src/frontends/qt/GuiView.cpp
@@ -1967,6 +1967,10 @@ bool GuiView::getStatus(FuncRequest const & cmd, FuncStatus & flag)
 		enable = doc_buffer != 0;
 		break;
 
+	case LFUN_MASTER_BUFFER_FORALL:
+		enable = doc_buffer != 0;
+		break;
+
 	case LFUN_BUFFER_WRITE:
 		enable = doc_buffer && (doc_buffer->isUnnamed() || !doc_buffer->isClean());
 		break;
@@ -4179,6 +4183,25 @@ void GuiView::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 			break;
 		}
 
+		case LFUN_MASTER_BUFFER_FORALL: {
+			if (!doc_buffer)
+				break;
+
+			FuncRequest funcToRun = lyxaction.lookupFunc(cmd.getLongArg(0));
+			funcToRun.allowAsync(false);
+
+			for (Buffer const * buf : doc_buffer->allRelatives()) {
+				// Switch to other buffer view and resend cmd
+				lyx::dispatch(FuncRequest(
+					LFUN_BUFFER_SWITCH, buf->absFileName()));
+				lyx::dispatch(funcToRun);
+			}
+			// switch back
+			lyx::dispatch(FuncRequest(
+				LFUN_BUFFER_SWITCH, doc_buffer->absFileName()));
+			break;
+		}
+
 		case LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR:
 			LASSERT(doc_buffer, break);
 			doc_buffer->clearExternalModification();