allow_accept FUNCTION for .DCL

I'm having trouble understanding the "allow_accept" attribute as it applies to programmable dialog boxes. I read the definition in the Visual Lisp HELP section. However, I experimented by altering some code in the ACAD.DCL file and found no difference in the way the dialog box performed. For example, below is an excerpt from the ACAD.DCL file (Support directory). Note that "allow_accept=true". When I changed the code to "allow_accept=false", I found no difference in the way this particular text editing dialog box behaves (with regard to its buttons when the "Enter" key is pressed). Can someone please explain to me why I don't see any difference between the "true" and "false" settings?

acad_txtedit : dialog {
label = "Edit Text";
initial_focus = "text_edit";
: edit_box {
label = "Text:";
key = "text_edit";
edit_width = 100;
edit_limit = 2048;
allow_accept = true;
}
ok_cancel;
}

 

Same here:

alow_accept = False

I can hit enter with no results.

alow_accept = true

I hit enter and the accept button is returned.

Bill