Window handle

Windows XP, AS perl 10 1005

I am trying to get the window ID/handle of a window from another application within a Tkx GUI app.

Something like WinSpy++ does, drag and drop to the target window and get the window ID.

I am using Win32::GuiTest to write to the window once identified.

Any suggestions how to proceed ?

Thanks,

Sylvain Thibault