How to Enable Trackpad Dragging on OS X


I have recently updated the OS X to Yosemite on my Mac Air. All was good except that the “double tab on the trackpad to drag an item around the screen” function stopped working. I had a look around in the System Preference but couldn’t find anything. Mainly because I didn’t know that the “double tabbing on the trackpad to drag stuff on the screen” action was actually called “Trackpad Dragging“! Else, it would be so much easier to search the Mac or the Internet for a fix. I tried to live without of it but soon the annoyance was creeping up on me. After a bit of persistent research, I found where Apple hid the option to enable “Trackpad Dragging“. The following explains How to Enable Trackpad Dragging on OS X:


  1. Go to System Preference system-preference
  2. Click on Accessibility accessibility-icon
  3. Scroll down to Mouse & Trackpad accessibility
  4. Click on Trackpad Options
  5. Select Enable Dragging
  6. Select option With Drag Lock
  7. Click OK

TextWrangler Codeless Language Module

I have always been using text files to manage my todo lists but only recently been enlightened of the Todo.txt concept. This post will teach you how to write and deploy a markup definition file for TextWrangler on Mac so it will automatically highlight your Todo.txt like this:


Tools I use:

Notes on the tools:

The concept of the Todo.txt is very simple. There are only 3 rules to follow:

  • Priority e.g. (A), (B), (C) and I added (U) for undecided
  • Project e.g. +Health
  • Context e.g. @home

I won’t elaborate too much here because you can learn more by visiting this page from the Todo.txt website or click here to download a sample file.

To make sure that TextWrangler highlights my Todo list as I wish, I wrote a .plist (property list file) for my installation of TextWrangler on my Mac. What is TextWrangler? It’s a text editor that offers much more functionality than Notepad. It’s a Mac equivalent to Notepad++ – my favourite text editor on Windows OS. I would suggest any programmer to use TextWrangler.


My .plist reference to the TextWrangler Codeless Language Modules. The following is the contents of my ToDoCodelessLanguageModule.plist

To Do






Language Features

Comment Pattern

String Pattern
Identifier and Keyword Character Class

The code above is open source so feel free to use it at your own risk. If you are going to repost it else where, I hope that you would give credit to me.


The ToDoCodelessLanguageModule.plist should be saved to folder: ~/Library/Application Support/TextWrangler/Language Modules

  • Priorities will be highlighted as blue
  • Projects and contexts will be highlighted as red
  • 2 types of comments: line comments starts with a # symbol; block comments are enclosed in /* … */
  • A completed task will be highlighted the same colour as a comment
  • To mark a task completed and ensure the highlighting was applied, you must follow the format: X YYYY-MM-DD (see screenshot at the beginning of this post for more details)

To test it, start a new file in TextWrangler and save it as a .todo file. For example:


Close the file then open it again, try to type “(A) Call Mom @Phone +Family”, the automatic highlighting should start as you type.

You can also verify it by checking that “To Do” appears on the language bar as a user defined language. For example:


iMessage Not Showing on Multiple Mac


SMS texts messages are received on iPhone fine but is only forwarded to one of the Macs, regardless of the model of Mac.

I have a slick Mac Air that I take with me everywhere and a sexy iMac at home. To keep all my offline data synced, I find it easier sometimes just to restore my Mac Air to the iMac or vice versa. The restoring process is not difficult, just use the Migration Assistant with the connection to a Apple Time Machine.

I soon find out that the SMS text messages that I receive on my iPhone would only be forwarded to one of the Macs, not both. I turned off iMessage on the iPhone then enabled it again but I can only see one of the Macs displayed under the Text Message Forwarding option. For example:



My research online led me to an Apple Support Forum. The poster Macsterguy explained this error as a Keychain issue which made total sense. Because the user on one Mac was restored from another, it would be possible that for the users on both Macs, the restored and original, to have the same user ID (UUID). In that case, the two Macs could be misinterpreted as one to the iPhone. Follow these steps to check the user UUID:

  1. Open System Preferences
  2. Click on Users & Groups
  3. Right click on the user in the current user list
  4. Select Advanced Options (if this does not appear, check that the “Click on the lock to prevent changes” option at the bottom of this window has been turned off.)

I would not advise you to change anything under the Advanced Options.


  1. Turn off the iMessages option under Messages on the iPhone (see the image above for the location of the option)
  2. Login to ALL Macs as the restored user
  3. Sign out of iMessage on ALL the Macs via the Messages application
    1. Open Messages application on the Mac
    2. Go to Menu
    3. Click on Messages, then Preferences
    4. Click on Accounts tab
    5. Select the account then click on the Sign Out button
  4. Quit the Message application on ALL the Macs
  5. Open the Keychain application on ALL the Macs
  6. Backup the key “ localdevice-AuthToken” on ALL the Macs
  7. Delete the key “ localdevice-AuthToken” on ALL the Macs
  8. Restart ALL the Macs and the iPhone
  9. Sign in to iMessage on ALL the Macs and the iPhone

Now you should see multiple devices listed in the iPhone.