OK, I'm not lying :)

Here's the excerpt from the help for WVISIBLE() (VFP 6, SP3):

Arguments

WindowName

Specifies the name of the window WVISIBLE( ) evaluates.
In Visual FoxPro, you can also specify the name of a toolbar.
You can also include the empty string in WindowName to specify the main Visual FoxPro window.

>>I was looking for that reference and read right over it without seeing it. I'm getting too old or it's time for a new prescription (and it's not that I'm too old). ;-)
>
>I don't even see that now!.
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>There is an explanation, however, and I don't think it relates to necessarily to the VFP main window.
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>As you probably, Larry, VFP internally manages it's windows via what's referred to as a whandle. It's like a window handle. The foxtools library, in fact, includes a function (_WhTohWnd()) to translate these values.
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>Now when you pass a window name, "Command" for example, to WVISIBLE(), if the command window is visible, you get .T. It also has a whandle that can be returned via _WFindTitl().
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>Here's the deal. _WFindTitl() returns a whandle that is different from the main VFP window's when a "" is passed.