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Use HTML signatures with Mail on iOS 6 iOS devices
With iOS 6, you can now add different signatures for different e-mail accounts, but you can also add logos, links and styled text.

If you have an HTML or styled signature in Mail on OS X, do the following:

1. Send an e-mail to your account with the signature from OS X.
2. Open the e-mail on your iOS device, then tap and hold the signature text.
3. Select all the text and images of your signature, and then copy it.
4. Go to Settings > Mail, contacts and Calendars > Signature. In the text field, tap and hold again to display the Paste menu and paste your signature.

Only styled text (bold, italic or underlined), plus images and links will be copied. Text colors or font sizes will not.

[kirkmc adds: We had a hint giving a much more complex way of doing this back in April. This is very easy to do, requires no third-party software or futzing around with backups. Though, to be fair, think carefully if you really need images and logos in your e-mail signature…]
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Reduce CPU usage by removing video files from the Desktop System 10.6
I was working on my iMac recently when I noticed the hard disk was working overtime. I checked Activity Monitor and found out the Finder was eating into my CPU, from 40% to over 100%. I decided to take everything off my Desktop and enclose it in a folder. Doing so reduced the CPU to nothing until I opened the folder containing the documents. I narrowed it down eventually to an MKV file I had. I can only assume it was QuickLook rendering the movie.

Reduce the files on your desktop, especially movies as these seem to eat into CPU even though you are not using them. Even normal files need rendering every time your Mac launches, so there's no need to leave them there.

[kirkmc adds: The idea isn't new; we covered this back in 2005, and it's pretty well known that files on the Desktop can slow down Macs. The reason I'm posting this is because I have seen the same thing since Mountain Lion. (The hint was submitted as a 10.6 hint, but I've only seen this excess activity since 10.8) I have some video files on a network volume, and if I open a folder containing the files, I can see the network traffic and see in Activity Monitor that QuickLook is working very hard. So not only can this slow down your Mac because of CPU usage, but it can also cause a lot of network activity, if you have such files on a network volume.]
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Easily enter different e-mail addresses in Safari on iOS iOS devices
I've recently needed to fill in an e-mail address in Safari on my iPad for a number of sites. I have multiple e-mail addresses and they're not trivial to type. I kept thinking "why doesn't Safari let me pick one of my addresses to fill in here?" While I couldn't find a way to make that happen, I realized I could do this by creating shortcuts for my commonly used email addresses and get a very similar result.

To do this, go to Settings > General > Keyboard > Shortcuts. Tap on Add New Shortcut, enter a "phrase" - this can be a single word, an e-mail address or a longer text - then enter a shortcut. For example, to enter myname@example.com, enter a shortcut such as "myn."

[kirkmc adds: I've been using shortcuts for some user names that aren't e-mail addresses, since I generally use the same address on most websites, but this is a good way of easily entering any kind of text. If you don't know about them, you should.

One interesting thing to point out: shortcuts sync across devices via iCloud, as long as you have Documents & Data syncing turned on in the iCloud settings. So set up a bunch of shortcuts on one device and they'll propagate to others.]
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Enable AFP Server Activity log on OS X Server OS X Server
Apple has published a technical note explaining how to enable the AFP Server Activity log on OS X Server; this log is not enabled by default.

Run the following command to enable this log:
sudo serveradmin settings afp:activityLog=yes
To disable the log, run this command:
sudo serveradmin settings afp:activityLog=no
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View tweets made by your contacts System 10.8
If you have Twitter handles for your friends and colleagues in your Contacts, you can easily view tweets those people have made. Just open a card in Contacts, click on Twitter, then choose View Tweets. If you have the official Twitter app installed, it will open displaying tweets from that person. If not, a web page will open on the Twitter web site.

You can also tweet to someone from OS X by clicking on Twitter, and choosing Tweet, as long as you have set up your Twitter account in the Mail, Contacts & Calendars pane of System Preferences.

While viewing tweets is nice, it would be even better if they could open in one's favorite Twitter client. But that would presumably involve hacking Contacts. Anyone interested in trying to figure it out?
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Access file attachments from iCloud Notes
You can add certain types of files as attachments to Notes by dragging and dropping them. They'll sync via iCloud, so this can be an easy way to share files across two Macs. You can also access attachments you've added to notes from the icloud.com website; to download an attachment in a note, just double-click it.

[kirkmc adds: You cannot, however, access file attachments on iOS devices; they just show up as paper clips. Surprisingly, even photos don't show up in notes on my iPhone. Note syncing is abysmal, as is much of iCloud syncing; notes don't update correctly, or at all, some notes can't be saved from the web interface, and on iOS, it's a crap shoot whether notes display or not.]
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Take screenshots of sheets with Command-Shift-4 System 10.8
I'm not sure when this became available, but I don't seem to remember it happening before 10.8. You can now take screenshots of sheets within a window by pressing Command-Shift-4.

A sheet is a dialog that drops down from a window, but is attached to that window. To take a screen shot of one, press Command-Shift-4, then press the space bar, which displays a small camera cursor that you use to select the window to shoot. If you want to take a screenshot of a sheet, press the Command key, and you can select only that sheet, and not the entire window behind it.

You can try this by going to the Finder and pressing Command-Shift-G, or choosing Go > Go to Folder; what displays is a sheet.

[kirkmc adds: I certainly didn't know this, and don't find it anywhere on the site.]
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Partition a Fusion drive Other Hardware
This is less of a hint than a heads up. I was chatting with Rob Griffiths yesterday, the creator of this web site, wondering if one can partition a Fusion drive. It turns out that you can, but only the hard drive part of it. This, and many other questions, are addressed in this Apple technical note, which is worth reading. The Fusion drive is a new technology, and has certain limitations because of the way it works, but it can be useful to see what these limitations are.
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Re-Enable Apple provided Java applet plug-in System 10.8
If you installed the Java for OS X 2012-06 update, you'll have found that it does the following:

"This update uninstalls the Apple-provided Java applet plug-in from all web browsers. To use applets on a web page, click on the region labeled "Missing plug-in" to go download the latest version of the Java applet plug-in from Oracle."

If you wish to re-enable the original Java applet plug-in - which is not uninstalled, as claimed above, but simply disabled - Apple has published a technical note explaining how to do this. There are a few Terminal commands, including creating a couple of symlinks. The technical note also explains how to disable Java Web Start.

The technical note also gives a URL where you can download the Oracle Java 7 JRE, which will be the future version of Java for OS X.
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Play 1080p videos on 2nd generation Apple TV Other Hardware
Having searched the web, I could not find any reference to playing 1080p videos on the 2nd generation Apple TV (fully updated with the latest firmware). The Wikipedia entry, for example, states that it is 720p only. But my experiments show that 1080p movies can play just fine. The problem comes when downloading 1080p movies from the iTunes store. This hint shows how to quickly play such downloads.

Prior to purchasing a 1080p movie from the iTunes store I ran many experiments with self-created videos (Blu-Ray rips) to ensure that such HD files could be played.

So I completed my experiments by purchasing a 1080p movie (Vertigo to be exact). iTunes downloads two versions when making such purchases: the HD version and a SD one. Both are stored in the same iTunes folder and iTunes itself shows an HD:SD badge. The problem here is that the 2nd generation Apple TV only shows the SD version and therefore only plays the SD version.

To play the HD version, locate the files in the Finder, then delete the movie from iTunes, opting to keep the files. Then add back just the HD version and the 2nd generation Apple TV shows it as HD and plays as HD. There was a very small pause at the start of the film as I was watching, but I have a fast network, so the download to the Apple TV was soon a few minutes ahead of the play position.

I think I will actually go back to purchasing the 720p versions as my eyes are not quite what they were and I cannot really tell the difference. This was just an experiment to prove a point.

[kirkmc adds: I don't have a 2nd generation Apple TV to test this…

Update: It turns out that the Apple TV 2 can only output 720p, so it must be downscaling the 1080p videos. However, according to the poster, it is playing these videos, so you can have only 1080p videos in your iTunes library and play them through this device, apparently, instead of it defaulting to SD versions. But I still can't test this to see what's really going on.]
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