What is the best way to put up net lights in a bay window?

For anyone who has done this in previous years, what's the easiest way to put up a large set of Christmas net lights in a bay window. ie how to fix them on. Is there fixings you can buy? Would rather not use nails as they're old sash windowsWhat is the best way to put up net lights in a bay window?
The best way is to buy suction cups with hooks. They can be bought everywhere. I have used them inside and out.What is the best way to put up net lights in a bay window?
im sure there are specialised products to do this, but to be honest sellotape always works for me? even in the kitchen