It's better if you explain what it is that you want to accomplish than 
insist on how it gets accomplished. 

The variable <<currentTiddler>> is available to all "children" of a 
tiddler, assuming that by children you mean transcluded or templated 
tiddlers. If you have some other interpretation of what children are, then 
you need to explain what you want to accomplish.

If you have a tiddler with several transclusions, and then clone that 
tiddler, all the transclusions of the clone will then use their 
<<currentTiddler>> value.

Good luck,

On Thursday, August 10, 2017 at 3:52:30 PM UTC-7, TonyM wrote:
> A Quick description, I hope it helps
> Psudo-Constants
> TiddlerA has a title or field name
> To set a constant you need to define a "variable" using the value of the 
> tiddler title or field, however when you use any reference to the title or 
> field it will be a string that refers to the field not the current value of 
> the field. As a result it gets wikified in context and may refer to another 
> tiddlers title or field depending on where it is used.
> I have used two variable names and wikify to partially solve this. Quite 
> cumbersome and it took time to find this solution. The ability to use the 
> constant still seems limited.
> \define currentobjectsrc() 
> {{!!title}}
> \end
> <$wikify name="currentobject" text=<<currentobjectsrc>>>
> I can now use the value in subtiddlers using <<currentobject>> but only 
> where this is valid. It retains its value (in this case "the text 
> "TiddlerA" in all subtiddlers, Can I use nested {{{}}} or something to make 
> this work in macros and filters ? I am still trying to learn the different 
> ways in the different widgets macros, template tiddler etc... Actually I 
> know the answer to this it is documented at however it is 
> very contextual.
> Perhaps there is a specific use of $set that is available to me, but I 
> have not found it yet. It would be great if I could use a simple command 
> like
> <$set Constant=constantname value=((!!title}}>
> Such the constantname now contains "TiddlerA" and can be accessed by 
> various and consistent means in all subTiddlers (those called/Transcluded) 
> by TiddlerA
> To be clear I want to use {{!!title}} not {{TiddlerA!!title}} because I do 
> not want to hard code "TiddlerA" into the TiddlerA tiddler because when 
> cloned or copied it will have a new name or a different value in a field.
> I have found many of the documented syntax or examples refer to "somename" 
> rather than a name derived from a field, that does not change with tiddler 
> or context.
> I will try and publish into on my project soon, and perhaps there are 
> other ways do achieve what I am doing. 
> I am now in the process of memorising a "dozen" "substitution rules" to 
> understand this.
> Thanks For the help.
> TonyM
> On Friday, August 11, 2017 at 5:11:35 AM UTC+10, Danielo Rodríguez wrote:
>> I'm still not understand why the set widget does not work for you. It 
>> sets a variable with certain name and that variable is accessible to all 
>> it's children . How is your requirement different ?

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