no wait dialog of mdichild vs pure no wait dialog

[ShumingWang]

Hi,
a very stupid question ,what is the different between no wait dialog of mdichild vs pure no wait dialog ?

DEFINE WINDOW oWndChild MDICHILD OF oWnd FROM 5,5 TO 6,6
define dialog odlg of owndchild resource "aaa"
redefine get var1 id 101 of odlg
...
activate dialog odlg no wait valid (owndchild:end()
activate dialog window owndchild

vs
define dialog odlg resource "aaa"
redefine get var1 id 101 of odlg
...
activate dialog odlg no wait

TKS!
Shuming Wang