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    <p>Thanks Abhijit, that function seems to do the job, I also found this link which had sample code:</p> <p><a href="http://delphi.newswhat.com/geoxml/forumhistorythread?groupname=borland.public.delphi.nativeapi.win32&amp;messageid=40914cf6@newsgroups.borland.com" rel="nofollow noreferrer">http://delphi.newswhat.com/geoxml/forumhistorythread?groupname=borland.public.delphi.nativeapi.win32&amp;messageid=40914cf6@newsgroups.borland.com</a></p> <pre><code>unit GetGroupsForUserUnit; interface uses Windows, SysUtils, Classes, ShellAPI; type {$EXTERNALSYM NET_API_STATUS} NET_API_STATUS = DWORD; LPLOCALGROUP_USERS_INFO_0 = ^LOCALGROUP_USERS_INFO_0; {$EXTERNALSYM LPLOCALGROUP_USERS_INFO_0} PLOCALGROUP_USERS_INFO_0 = ^LOCALGROUP_USERS_INFO_0; {$EXTERNALSYM PLOCALGROUP_USERS_INFO_0} _LOCALGROUP_USERS_INFO_0 = record lgrui0_name: LPWSTR; end; {$EXTERNALSYM _LOCALGROUP_USERS_INFO_0} LOCALGROUP_USERS_INFO_0 = _LOCALGROUP_USERS_INFO_0; {$EXTERNALSYM LOCALGROUP_USERS_INFO_0} TLocalGroupUsersInfo0 = LOCALGROUP_USERS_INFO_0; PLocalGroupUsersInfo0 = PLOCALGROUP_USERS_INFO_0; const {$EXTERNALSYM MAX_PREFERRED_LENGTH} MAX_PREFERRED_LENGTH = DWORD(-1); {$EXTERNALSYM NERR_Success} NERR_Success = 0; {$EXTERNALSYM NERR_BASE} NERR_BASE = 2100; {$EXTERNALSYM NERR_UserNotFound} NERR_UserNotFound = (NERR_BASE+121); {$EXTERNALSYM NERR_InvalidComputer} NERR_InvalidComputer = (NERR_BASE+251); {$EXTERNALSYM LG_INCLUDE_INDIRECT} LG_INCLUDE_INDIRECT = $0001; {$EXTERNALSYM NetUserGetLocalGroups} function NetUserGetLocalGroups(servername: PWideChar; username: PWideChar; level: DWORD; flags: DWORD; var bufptr: Pointer; prefmaxlen: DWORD; var entriesread: DWORD; var totalentries: DWORD): NET_API_STATUS; stdcall; {$EXTERNALSYM NetApiBufferFree} function NetApiBufferFree(Buffer: Pointer): NET_API_STATUS; stdcall; function GetGroupsForNetUser(uname: widestring): string; implementation function NetUserGetLocalGroups; external 'netapi32.dll' name 'NetUserGetLocalGroups'; function NetApiBufferFree; external 'netapi32.dll' name 'NetApiBufferFree'; function GetGroupsForNetUser(uname: widestring): string; // NetUserGetLocalGroups - returns semi-colon delim string of groups. // Pass in user value returned by GetUserName to get current user. var bufptr: Pointer; Status: NET_API_STATUS; PrefMaxLen, EntriesRead, TotalEntries: DWord; i: integer; pTmpBuf: LPLOCALGROUP_USERS_INFO_0; begin PrefMaxLen := MAX_PREFERRED_LENGTH; Status := NetUserGetLocalGroups(nil, PWideChar(uname), 0 , LG_INCLUDE_INDIRECT, bufptr, PrefMaxLen, EntriesRead, TotalEntries); case Status of NERR_Success: begin result := 'success, but no groups'; pTmpBuf := bufptr; if pTmpBuf &lt;&gt; nil then begin result := ''; for i := 0 to EntriesRead - 1 do begin if pTmpBuf &lt;&gt; nil then begin if result = '' then begin result := pTmpBuf.lgrui0_name else result := result + ';' + pTmpBuf.lgrui0_name; end; Inc(pTmpBuf); end; end; end; ERROR_ACCESS_DENIED: begin result := 'The user does not have access.'; end; NERR_InvalidComputer: begin result := 'The computer name is invalid.'; end; NERR_UserNotFound: begin result := 'The user name could not be found. (' + uname + ')'; end; else begin result := 'Unknown error.'; end; end; if bufptr &lt;&gt; nil then NetApiBufferFree(bufptr); end; end. </code></pre>
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    1. POHow to find whether a Windows user belongs to specified group?
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