You might want to use multiple forms for the same document if you are exposing a Notes DB for ODBC, for the web or for similar but different data entities. I have used the following technique successfully instead of using complicated and difficult to maintain hide-when formulas or conditional subforms.
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Set the form formula on all your views to reference a field on the document
other than "Form" Then vary that field depending on context.
I'm not so sure what might happen for forms submitted via web. I think Domino
might change the value of Form on the document. Beware. For read-only this works well.
If the document does not have a FormDisplay or FormWeb, then it will use the
default (i.e. Form).
An example formula for use on the view form formula:
"Notes" = @ClientType;
@if( "" != FormDisplay; FormDisplay; "" );
"Web" = @clienttype;
@if( "" != FormWeb; FormWeb; "" );