From VFP 6.0 help:

"FunctionName

Specifies the name of the shared library function to register in Visual FoxPro. Function names passed in this parameter are case-sensitive."

"AS AliasName

Specifies an alias name for a shared library function name that has the same name as a Visual FoxPro function or is not a legal Visual FoxPro name. AliasName should not be a Visual FoxPro reserved word or the name of a shared library function already registered with Visual FoxPro.

If you assign alias to the function, use the alias when calling the shared library function. AliasName is not case-sensitive."

>

declare Sleep in win32api as Sleep

>makes it case insensitive
>
>The function name is case insensitive in VFP outside DECLARE statement.

declare Sleep in win32api integer