well paul there are very good technical reasons, which are the best kind of reasons, that user-agent has been a nest of deception for decades and you only need to read this wrox book with cthulu for the author photo to understand u̸̻̓̋s̵̻̬͊e̶̐ͅr̶͙̫̂-̴̱̞̅̔a̵̩͌g̵̳̊e̵̡̥̚ń̸̜̠̆t̵̖̀̿