John R. Culleton wrote:
> On Wednesday 08 August 2007, Taco Hoekwater wrote:
>> Wolfgang Werners-Lucchini wrote:
>>>>>> well, i still use texfont for type 1 fonts, but for open type
>>>>>> i use luatex anyway which can handle it directly (actually,
>>>>>> mkiv also usese afm files instead of tfm when available, so
>>>>>> texfont is not needed any more)
>>>>> How stable/reliable is LuaTeX for general use?
>>>> Well, "not at all" is the wisest answer I can give.
>>> Is it possible to run both (mkiv/LuaTeX and mkii/pdfTeX) in
>>> parallel?
>> Certainly. In the past year, I have been happy running all of these
>> at the same time:
>>
>>      texexec  | texexec --pdftex  % engine=pdftex
>>      texexec --aleph              % engine=aleph
>>      texexec --luatex             % engine=luatex
>>      texexec --xetex              % engine=xetex
> 
> Is there a phrase or a sentence that will describe the distinguishing 
> characteristcs and/or status of each of these choices?  Well, we know 
> about the first one :<) I am bewildered by the rapid changes. 

pdftex : traditional tex engine, extended with some functionality
aleph  : wide font multidirectional tex engine with input parsing
xetex  : unicode tex engine with open type support based on libs
luatex : unicode tex engine with embedded scripting machinery

luatex has pdftex and aleph as starting point and depends on lua code 
for advanced font (etc) support

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