Window

As i said i dont use blitz3d i cant even test this myself but give this a try

Local x=50
Local y=50
Local width=800
Local height=600
Local ontop=True

AppTitle "test" 

Graphics width,height

Const HWND_TOPMOST = -1 
Const HWND_NOTOPMOST = -2 
Const SWP_NOSIZE = 1 
Const SWP_NOMOVE = 2 
Const SWP_SHOWWINDOW = 40 
Const SW_RESTORE=9

WinSettings( x, y, width, height, ontop )

While Not KeyHit(1)

CheckMin()

Flip
Wend
End

Function WinSettings( x, y, width, height, topmost ) 
hwnd=api_FindWindow("Blitz Runtime Class","test" ) 
Select topmost
Case True 
topmost=HWND_TOPMOST
Case False 
topmost=HWND_NOTOPMOST
End Select 
Api_SetWindowPos( hwnd, topmost, x, y, width, height, SWP_SHOWWINDOW Or SWP_NOMOVE Or SWP_NOSIZE ) 
End Function

Function CheckMin()
hwnd=api_FindWindow("Blitz Runtime Class", "test") 
If api_IsIconic(hwnd)=True Then
api_ShowWindow(hwnd,SW_RESTORE)
End If
End Function

userlib commands can be found here - http://www.blitzbasic.co.nz/Community/posts.php?topic=27586

[edit]code updated

Hope it works.