BitBlt & Lander Tutorial

When i try to do the picture copy in the lander tutorial, it always says sub or function not defined and points at BitBlt

[V(ery) Basic]

You did put:

Public Declare Function BitBlt Lib "gdi32" Alias "BitBlt" (ByVal hDestDC As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long

in a bas module, didn't you?