diff --git a/lib/shared/dm-ops/process-dm-ops.js b/lib/shared/dm-ops/process-dm-ops.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/dm-ops/process-dm-ops.js
@@ -0,0 +1,34 @@
+// @flow
+
+import * as React from 'react';
+
+import { dmOpSpecs } from './dm-op-specs.js';
+import { useLoggedInUserInfo } from '../../hooks/account-hooks.js';
+import { useGetLatestMessageEdit } from '../../hooks/latest-message-edit.js';
+import type { DMOperation } from '../../types/dm-ops.js';
+
+function useProcessDMOperation(): (dmOp: DMOperation) => Promise<void> {
+  const fetchMessage = useGetLatestMessageEdit();
+  const utilities = React.useMemo(
+    () => ({
+      fetchMessage,
+    }),
+    [fetchMessage],
+  );
+
+  const loggedInUserInfo = useLoggedInUserInfo();
+  const viewerID = loggedInUserInfo?.id;
+  return React.useCallback(
+    async (dmOp: DMOperation) => {
+      if (!viewerID) {
+        console.log('ignored DMOperation because logged out');
+        return;
+      }
+      await dmOpSpecs[dmOp.type].processDMOperation(dmOp, viewerID, utilities);
+      // TODO: dispatch Redux action
+    },
+    [viewerID, utilities],
+  );
+}
+
+export { useProcessDMOperation };
diff --git a/lib/tunnelbroker/use-peer-to-peer-message-handler.js b/lib/tunnelbroker/use-peer-to-peer-message-handler.js
--- a/lib/tunnelbroker/use-peer-to-peer-message-handler.js
+++ b/lib/tunnelbroker/use-peer-to-peer-message-handler.js
@@ -17,6 +17,7 @@
   verifyAndGetDeviceList,
   removeDeviceFromDeviceList,
 } from '../shared/device-list-utils.js';
+import { useProcessDMOperation } from '../shared/dm-ops/process-dm-ops.js';
 import { IdentityClientContext } from '../shared/identity-client-context.js';
 import type { DeviceOlmInboundKeys } from '../types/identity-service-types.js';
 import {
@@ -53,6 +54,8 @@
   const dispatchActionPromise = useDispatchActionPromise();
   const primaryDeviceRequestedLogOut = useLogOut(primaryRequestLogoutOptions);
 
+  const processDMOperation = useProcessDMOperation();
+
   return React.useCallback(
     async (decryptedMessageContent: string, senderInfo: SenderInfo) => {
       const parsedMessageToDevice = JSON.parse(decryptedMessageContent);
@@ -84,6 +87,10 @@
         await broadcastDeviceListUpdates(
           allPeerDevices.filter(deviceID => deviceID !== deviceIDToLogOut),
         );
+      } else if (
+        userActionMessage.type === userActionsP2PMessageTypes.DM_OPERATION
+      ) {
+        await processDMOperation(userActionMessage.op);
       } else {
         console.warn(
           'Unsupported P2P user action message:',
@@ -97,6 +104,7 @@
       dispatchActionPromise,
       identityClient,
       primaryDeviceRequestedLogOut,
+      processDMOperation,
     ],
   );
 }
diff --git a/lib/types/dm-ops.js b/lib/types/dm-ops.js
--- a/lib/types/dm-ops.js
+++ b/lib/types/dm-ops.js
@@ -1,6 +1,6 @@
 // @flow
 
-import type { TInterface } from 'tcomb';
+import type { TInterface, TUnion } from 'tcomb';
 import t from 'tcomb';
 
 import type { RawMessageInfo } from './message-types.js';
@@ -89,6 +89,11 @@
   | DMCreateThreadOperation
   | DMCreateSidebarOperation
   | DMSendTextMessageOperation;
+export const dmOperationValidator: TUnion<DMOperation> = t.union([
+  dmCreateThreadOperationValidator,
+  dmCreateSidebarOperationValidator,
+  dmSendTextMessageOperationValidator,
+]);
 
 export type DMOperationResult = {
   rawMessageInfos: Array<RawMessageInfo>,
diff --git a/lib/types/tunnelbroker/user-actions-peer-to-peer-message-types.js b/lib/types/tunnelbroker/user-actions-peer-to-peer-message-types.js
--- a/lib/types/tunnelbroker/user-actions-peer-to-peer-message-types.js
+++ b/lib/types/tunnelbroker/user-actions-peer-to-peer-message-types.js
@@ -3,10 +3,12 @@
 import t, { type TInterface, type TUnion } from 'tcomb';
 
 import { tShape, tString } from '../../utils/validation-utils.js';
+import { type DMOperation, dmOperationValidator } from '../dm-ops.js';
 
 export const userActionsP2PMessageTypes = Object.freeze({
   LOG_OUT_PRIMARY_DEVICE: 'LOG_OUT_PRIMARY_DEVICE',
   LOG_OUT_SECONDARY_DEVICE: 'LOG_OUT_SECONDARY_DEVICE',
+  DM_OPERATION: 'DM_OPERATION',
 });
 
 export type PrimaryDeviceLogoutP2PMessage = {
@@ -26,12 +28,24 @@
     type: tString(userActionsP2PMessageTypes.LOG_OUT_SECONDARY_DEVICE),
   });
 
+export type DMOperationP2PMessage = {
+  +type: 'DM_OPERATION',
+  +op: DMOperation,
+};
+export const dmOperationP2PMessageValidator: TInterface<DMOperationP2PMessage> =
+  tShape<DMOperationP2PMessage>({
+    type: tString(userActionsP2PMessageTypes.DM_OPERATION),
+    op: dmOperationValidator,
+  });
+
 export type UserActionP2PMessage =
   | PrimaryDeviceLogoutP2PMessage
-  | SecondaryDeviceLogoutP2PMessage;
+  | SecondaryDeviceLogoutP2PMessage
+  | DMOperationP2PMessage;
 
 export const userActionP2PMessageValidator: TUnion<UserActionP2PMessage> =
   t.union([
     primaryDeviceLogoutP2PMessageValidator,
     secondaryDeviceLogoutP2PMessageValidator,
+    dmOperationP2PMessageValidator,
   ]);