EuroAssembler

I noticed in the example for %SET2, that the directive %DataExp was used, but I can't find anything on the website that explains what it is or does. It looks like a function/macro for concatenating parameters inside a MACRO. Could you please explain %DataExp?

Ditto for %Suffix and %# in the WinAPI macro -- especially %#, which should be listed in the index.

Also, I noticed that €ASM supports VARARGs in the form of ,,,
That is a good feature that needs to be advertised somewhere, especially since it can be placed anywhere in the parameter list, with the only restriction being it only applies to ordinal arguments.

%DataExp used in the example for %SET2 https://euroassembler.eu/eadoc/index.htm#pcSET2 is an arbitrary chosen name of preprocessing variable, which is being assigned with %SET2, it is not a function/macro/directive. The only pseudoinstructions which begin with % are listed at https://euroassembler.eu/eadoc/index.ht ... structions and I write them in upper case. Other identifiers, which are not part of the language, are written in mixed case.
Ditto the term %suffix used in https://euroassembler.eu/maclib/winapi.htm#WinAPI, it is user-defined preprocessing variable, which will be assigned with the letter 'A' or 'W', or which will be left empty if the invoked API function has not ANSI | WIDE variant.

Special automatic variable %# represents the number of ordinal operands used in macro, it is described at https://euroassembler.eu/eadoc/#AutomaticVariables. You are right, it doesn't appear in index and it's not searchable by the applet in title strip. I'll fix that in the next release, thank you.

Got it.