I live in a ground floor flat. My cat has demonstrated that she is well able to come and go through any open window in my flat - even the high one at the top of the window frame. Sometimes, however, she will sit (or lay) on the ground just outside the living room window and cry for attention. If I go all the way outside, she generally bolts inside. If I go to the window and get her attention she just continues to cry at me.
She knows how to come back in so what is she asking for?