GHWND coming Null in Acrobat 8

Am using the condition if (NULL != gHWND) to check whether document has been loaded in Acrobat and is visible.
This is working in Acrobat 7 Standard/Professional However, in Acrobat 8 Standard/Professional gHWND is coming NULL even after the document is opened causing the condition to fail.
Please suggest whether the functionality of gHWND has changed or what needs to be checked to determine whether the document has been opened and window is visible.

Aandi,
The piece of code using gHWND is doing the following tasks
1. Checking that a particular key is present in the document's Info dictionary.
2. Checking whether the Adobe window is visible using gHWND as this would contain the HWND of the main Acrobat Window.
Below is my code
---------------------------------------------------------------------- BOOL blnEADoc = false;
DURING
// Ensure that the EA_DOCUMENT key is present
if (0 < PDDocGetInfo(thePDDoc, EA_DOCUMENT_KEY, NULL, 0))
// Must also be visible!
if (NULL != gHWND)
blnEADoc = IsWindowVisible(gHWND);
Regarding the AVWindowIsVisible function, it needs a parameter of type "AVWindow". Please suggest what to pass in this parameter.
Please also suggest how to get the HWND associated with the Acrobat window for passing in the SetTimer Windows SDK function.

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