Has anyone seen information on custom window classes.  I looked through 
documentation about classes but I was not able to fine what I remembered.
I thought there was a way to add a modifier to a window class so that you
can treat one window differently than another based on its class.  As an
example of what I mean if you have two document windows that are derived
from _kDocumentWindowClass but one document is considered a spreadsheet
while the other is considered a chart.  To distinguish one from another you
added created the window as _kDocumentWindowClass + _spreadSheet or
_kDocumentWindowClass + _chart as needed.  If you needed to cycle through
just the spreadsheets you did something like this

local fn UpdateAllSpreadsheetWindows( windClass as long )
'~'1
dim as WindowRef w

w = fn GetFrontWindowOfClass( windClass, _true )

long if ( w )
fn UpdateSingleWindow( w )
while ( w != _nil ) 
w = fn GetNextWindowOfClass( w, windClass, _true)
long if ( w != _nil ) 
fn UpdateSingleWindow( w )
end if
wend

end if

end fn


windClass = _kDocumentWindowClass + _spreadSheet

fn UpdateAllSpreadsheetWindows( windClass  )

OK, that was the long-winded version of asking, has anyone seen where you
add custom window classes.  I was sure they existed.  As an alternative I
could add a window property denoting the custom class and check it when
I cycle through windows but I thought I've seen what I've described before.

Any ideas?

[I've really got to get more sleep.  Exhausted]

Thanks,


W.