[NEW VERSION] - 1 Apr 17 

Added: Ability to set time taken for Toast to extend and retract (default 1.0/.5 sec) 

Fixed: An edge case bug where showing a new Toast while the previous was actually retracting caused the new Toast to vanish instantly.

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[BUGFIX VERSION] - 16 Jul 14

Fixed: Bug when adding a PNG in x64.

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[NEW VERSION] - 2 Jun 14

Some Global variables were renamed in AutoIt v3.3.12.0 - code updated to match.

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[NEW VERSION] - 20 May 13
 
Added: You can now display an image file as well as an icon.
 
Thanks to careca for the request.

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[NEW VERSION] - 13 Feb 12

Fixed:

Using the [X] to retract a Toast which returned directly to the script meant that the message queue still held the relevant event. If the retraction was followed by a subsequent Toast before the message queue had been cleared, this queued event was likely to be interpreted by AutoIt as a click on the [X] of the new Toast. The UDF now clears the message queue when a Toast pauses the script awaiting user input to prevent AutoIt acting on a queued event.

Running _Toast_Show before an [X] Toast retracted automatically left an Adlib function running which then retracted the subsequent Toast early.
 
Thanks to 1RV34 for reporting the bugs.
 
New - Toast location code rewritten. Location now correct when Classic display mode selected and if users reset the work area to place additonal toolbars above the TaskBar.

Thanks to jmon and MilesAhead for the reports - and guinness for spotting the problem both times.

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There are now 3 versions of this UDF available in this topic:

1. The original version in this post.
2. A version which can produce a colour gradient in the titlebar - you will need Yasheid's WinAPIEx UDF.
3. A version which can also display resources saved within the compiled exe - you will need Zedna's Resources UDF as well.

As my original intention was to offer code which did not require additional UDFs, I am only seriously supporting the original version.

However, as you can see from the above, I am quite happy to help you develop a more advanced version. No guarantees, but if you have a great idea for an additional feature, do let me know.