Modifying GDM3 Login

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http://www.linuxquestions.org – Hello all. I am hoping someone might be able to help me. I was using an older version of Debian on a DLI 8300 Tablet that used a custom Login screen. The Tablet had to be sent off for repairs and came back with new hardware and now that version of Debian does not support the hardware. So naturally I upgraded to the newest secure version of Debian which now supports the Hardware. However the GNOME has been upgraded to GNOME 3 and the files I once changed are no longer there. So my question is this. I need to set up a custom login screen that allows the user to remotely login to other linux des (HowTos)