I have a single *.tex file that I have setup, here's a simple minimal example: \define\macroA{This outputs some stuff.} \define\macroB{\input knuth } \define\macroC{This outputs other stuff.} \define\macroD{This outputs other stuff.} \define\macroE{This outputs other stuff.} \define[2]\macroF{This is text #1 and #2.} \define\macroG{This outputs other stuff.} \define\macroH{This outputs other stuff.} \starttext \macroA%\macroB%\macroC%\macroD%\macroE %%% some more code \macroF{a}{b}\macroG\macroH \stoptext Normally, I will compile it as above, so only two of the macros actually appear. But sometimes, for testing purposes, I want to make sure my code is functioning good, so I will go an un-comment all of the macros, and then compile, and it basically does a test, making sure all of the macros in my code function perfectly. When testing, it looks like this: \starttext \macroA\macroB\macroC\macroD\macroE %%% some more code \macroF{a}{b}\macroG\macroH \stoptext Because the actual file is quite large, commenting and un-commenting the lines takes a long time, and can lead to mistakes. Is there any simpler way to easily switch between the two versions? --Joel