Detect state of a windows that has been hidden thrue SW_HIDE?

Hi!
I have writed a code to Show/Hide a specific external Program.
I have also made a keyboard shortcut to directly hide or show the program.
But to switch between hide and show I need to get the state of my external window program.

Based on code after, How can I know if hwndWinamp is hidden or showed???

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var GGHandle : THandle;
classname: array[0..255] of char;
var hwndWinamp : THandle;
begin
GGHandle := FindWindow(nil,'External Appz');
GetClassName(GGHandle,ClassName,SizeOf(ClassName));
hwndWinamp := FindWindow(classname,nil);
ShowWindow(hwndWinamp, SW_SHOW);
or
ShowWindow(hwndWinamp, SW_HIDE);