Changing default blank command response

[Bainespal]

Is there a way to substitute something else for the default "What?" printed when the player hits enter without typing anything? I notice that the "What?" string is neither stored in Message in hugolib.h nor VMessage in verblib.h. I don't know where it comes from.

[Roody_Yogurt]

That message is ParseError with error number 0, although that is one of the messages provided by the engine itself:
http://hugo.gerynarsabode.org/index.php ... ParseError

Still, you can change it just the same using NewParseError:
http://hugo.gerynarsabode.org/index.php ... ParseError

[Bainespal]

Yes, thank you. I noticed that I needed to explicitly return true in the errornumber condition for my replacement string, or else it goes on to print the old "What?" after my replacement message.