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Topic env-query

ex­am­ine the TeX pro­gram­ming en­vi­ron­ment

De­tect "draft" and "fi­nal" class op­tions
Pro­vides \ife­tex switch
Ex­pand­able checks for the cur­rent lan­guage
Pro­vides the \iflu­a­tex switch
Pro­vides the \if­pdf con­di­tional
Con­di­tion­als to test which plat­form is be­ing used
Am I run­ning un­der pdfTeX, XTeX or LuaTeX?
De­tects use of VTeX and its fa­cil­i­ties
Am I run­ning un­der XTeX?
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