"B. Gimeno" <nomail@nomail> wrote:
> By the way, is there a powerful and unavoidable reason to introduce as a
> parameter the id_file handler?

Yes.  If the macro is called more than once.

I found a workaround, though.

#macro Write_something (Filename, N)
   #fopen F Filename append
   #write (F, N)
   #fclose F
#end

#declare FILE1 = "test.txt"
#fopen F FILE1 write #fclose F //zero the output file
Write_something (FILE1, "Hello,\n")
Write_something (FILE1, "world.\n")

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