How do I get a list of what Patients exist in VistA ?

There are several ways to find out what Patients exist in VistA.

A simple way is to use VA FileMan:

Select OPTION: PRINT FILE ENTRIES

OUTPUT FROM WHAT FILE: INSTALL// 2 PATIENT (359461 entries) SORT BY: NAME// START WITH NAME: FIRST// FIRST PRINT FIELD: NUMBER THEN PRINT FIELD: NAME

    1   NAME  
    2   NAME COMPONENTS  

CHOOSE 1-2: 1 NAME THEN PRINT FIELD: Heading (S/C): PATIENT LIST// DEVICE: HOME GENERIC TELNET TERMINAL Right Margin: 80// PATIENT LIST AUG 18,2009 11:11 PAGE 1 NUMBER NAME

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256807 ANDREWS,ARCHIE 220870 BECK,BLUTO 397624 BECK,BRUTUS 111345 BOOP,BETTY 348052 DUCK,DAISY 179792 DUCK,DONALD 264262 MOUSE,MICKEY 140335 PEA,SWEET 124961 OYL,OLIVE 2515 THE SAILOR,POPEYE