Journal Receiver Example. Help needed.

I have used code posted recently that showed how to get the name of the
attached journal receiver, (I forget who posted it, beg forgivness).
I modified the code to give me the names of ALL the receivers associated
with the journal and it works fine, please see below.
This API has a variable length parameter by which it returns data.
I use a DS (RJRN0100) to get the returned data
My problem is that RPG DS have a max size of 64K bytes.
In the archives I note Carsten Flensburg and others mention pointer
handles.
Can I use pointers to get back more than 64K bytes of data in case I have
more than 512 associated receivers.
Can I get the API to populate a User Space or a MODS.
I have used User Spaces previously but those APIs directly populated.
I have searched the archives but I am too thick to get it, any help is
muchly appreciated.

Frank Kolmann
PS  It may have been Carsten Flensberg  or Jon Paris who posted the
original.
but in any case I have significantly changed the original and I have not
been
able to find any code that gave me the names of the receivers like the
below does.

H DFTACTGRP(*NO) ACTGRP(*CALLER)  OPTIMIZE(*NONE)
D RtvJrnInf       PR                  ExtProc( 'QjoRetrieveJournal+
D                                               Information' )
D  RjRcvrVar                     1    Const
D                                     Options( *VarSize )
D  RjLenRcvrVar                 10I 0 Const
D  RjQlJrnName                  20    Const
D  RjFmtName                     8    Const
D  RjJrnInf                      1    Const
D                                     Options( *VarSize )
D  RjApiErr                           Like( ApiErr )
D ApiErr          DS
D  AeBytesProv                  10U 0
D  AeBytesRetd                  10U 0
D  AeMsgId                       7
D                                1
D  AeMsgDta                    256
 * This DS is initialised to request that we want ALL the
 * receivers associated with the journal
 * VD Key = 1 means Journal Receiver Directory Information
 *JrnInfToRtv     DS
 * JtrNumVarLenR  This is 1  as I am only sending(asking) for 1 set of info
 * VDLen          The length of this request is 16 bytes (this does not
incl JtrNumVarLenR)
 * VDKey          I am asking for the reveivers  (code is 1)
 * VDLenDta       This req passes no data but a min of 4 bytes must be
specified
 * VDDta          This is the 4 empty bytes
D JrnInfToRtv     DS
D  JtrNumVarLenR                10I 0 Inz(1)
D  VDLen                        10U 0 Inz(16)
D  VDKey                        10U 0 Inz(1)
D  VDLenDta                     10U 0 Inz(4)
D  VDDta                         4
D PrmJrnName      S             10
D PrmJrnLib       S             10
D DtaStr          S             10U 0
D RcvDtaPos       S             10U 0
D I               S             10U 0
D J               S             10U 0
D RJRN0100        DS         65535
D  RjBytesRetd                  10I 0
D  RjBytesAvl                   10I 0
D  RjKeyOffs                    10I 0
D  RjJnlNam                     10
D  RjJnlLib                     10
D  RjAttachRcvrN        201    210
D  RjAttachRcvrL        211    220
D  Rfill1               448    448
D  RjKeys                       10U 0

*****  Use offsets to get to the receiver info
D ApiKeys         DS
D  RjKey                        10U 0
D  RjKeyOff                     10U 0
D  RjKeyHdrLen                  10U 0
D  RjKeyNumEnt                  10U 0
D  RjKeyEntLen                  10U 0

*****  KEY 1 (Jnl Receiver data)
D RcvInf          DS         65535
D  RjTotRcv                     10U 0
D  RjTotRcvSiz                  10U 0
D  RjTotSizMult                 10U 0
D  RjResrv1                      8

D RcvInfDS        DS
D  RjRcvNam                     10
D  RjRcvLib                     10
D  RjRcvNbr                      5
D  RjRcvAttDte                  13
D  RjRcvSts                      1
D  RjRcvSavDte                  13
D  RjRcvLclSys                   8
D  RjRcvSrcSys                   8
D  RjRcvSiz                     10U 0
D  RjResrv2                     56
C     *Entry        Plist
C                   Parm                    PrmJrnName
C                   Parm                    PrmJrnLib
 /Free
     *INLR = *On;
  // Initialize bytes provided in two data structures
     AeBytesProv = %Size( ApiErr );
     RjBytesAvl  = %Size( RJRN0100 );
  //  Invoke the QjoRetrieveJournal API
     CallP     RtvJrnInf( RJRN0100:
                   %Size( RJRN0100 ):
                 PrmJrnName + PrmJrnLib:
                         'RJRN0100':
                         JrnInfToRtv:
                         ApiErr  );
  //  Following the above CallP, if AeBytesRetd = *Zero, then
  //  RjAttachedRcvrName contains the attached receiver name and
  //  RjAttachedRcvrLib contains the attached receiver library name
   RjAttachRcvrN  =   RjAttachRcvrN;
   RjAttachRcvrL  =   RjAttachRcvrL;
   DtaStr         =   RjKeyOffs + 5; //Key data actually starts from RjKeys
on
  // Now we are going to get all the receiver names
   for j = 1 to RjKeys;
   ApiKeys        =   %subst(RJRN0100 : DtaStr :%len(ApiKeys));
   If  RjKey = 1;   // Process Receiver Info
   ExSR  GetRcvNam;
   EndIf;
   endfor;
   BegSR  GetRcvNam;
   RcvInf         =   %subst(RJRN0100 : DtaStr+RjKeyOff );
   RcvDtaPos      =   DtaStr + RjKeyOff + RjKeyHdrLen- RjKeyEntLen;
   for j = 1 to RjKeyNumEnt;
   RcvDtaPos      =   RcvDtaPos +  RjKeyEntLen;
   RcvInfDS       =   %subst(RJRN0100 : RcvDtaPos);
     // Here we have the name of each Receiver in turn in RjRcvNam
   endfor;
   EndSR;
 /end-free
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