21 ELECTRONIC SYSTEM FOR HOSPITALS WHICH ALLOWS PERSONNEL TO ELECTRICALLY REGISTER IN AND OUT AT VARIOUS ENTRANCES AND STATIONS, AND PROVIDES MESSAGE INFORMATION UPON SUCH REGISTRATION; AND ADDITIONSALLY ELECTRONICALLY ASSOCIATES A MINIATURE POCKET PAGE RECEIVER WITH THE PERSONNEL AS THEY REGISTER IN, IN ORDER TO ALERT THE PERSONNEL WHEN THEY ARE NEEDED TO RECEIVE A MESSAGE; AND COMPONENTS FOR SUCH SYSTEM