Example:
Declare Function GetFocus Lib "User" () As Integer
Declare Function GetWindowText Lib "User" (ByVal hWnd%, ByVal Mess$, ByVal cbMax%) As _ Integer
Sub Main
Dim hWindow%
Dim str1 As String *51
Dim str2 As String * 25
hWindow% = GetFocus()
print "GetWindowText returned: ", GetWindowText( hWindow%, str1,51 )
print "GetWindowText2 returned: ", GetWindowText( hWindow%, str2, 25)
print str1
print str2
End Sub