Window and door screws upvc

[Jake2021]

Evening ,

I have a window to screw onto a upvc door frame ( on the side) I just wondered if anyone can recommend some screws to do this ?

Also am I better having the head of the screw in the door frame or in the window frame?
Thanks
Jake

 

[crank39]

Baypole screws, screw through the window into the door to hide the screws

 

[Jake2021]

Many thanks crank