I need my php and HTML page to be re configured.

Read full description I need my php page to be re configured. I have a very very simple php login page where I save username and password as php array, if use input matches he would be directed to another web page or else Whole system works on a php server setup on xamp on a PC and connecting through network.. no Internet I need following corrections 1- I need to add a button in my page and when user clicks in it it should open windows folder explorer and point to FTP address FTP://192..... :21 2 user login should be restricted, only one user should be able to login at a time from any system in the network 3- we use an iframe to load a particular link, if content for iframe is not available, user should be re directed to another page I think it’s just a half hour job for right person Codes will be uploaded soon