diff --git a/src/nzg_create.c b/src/nzg_create.c
index 0181106..960eb54 100644
--- a/src/nzg_create.c
+++ b/src/nzg_create.c
@@ -19,10 +19,22 @@ msgSpace * msgSpaceCreate(
   msgSpace * result;
   int shmId;
   msgSpaceId nzgId;
-  /* on créee */
+  msgSpaceList 
+  static spaceIdNum=-1;
+
+ spaceIdNum++;
+ /** recuperation de la liste des msgSpace **/
+ /* (creation si elle n'existe pas */
+
+  /** on créee le nouvel element **/
   printf("PAGESIZE : %d\n",(int)PAGESIZE);
   nzgId=msgSp2nzgId(spaceId);
-  if ((shmId=shm_open(nzgId,O_RDWR,MSGSPACE_DEFAULT_MODE)) < 0){
+  shmId=shm_open(
+	  nzgId,
+	  O_RDWR|O_CREAT|O_EXCL,
+	  MSGSPACE_DEFAULT_MODE
+	  );
+  if (shmId < 0 ) {
 	perror("shm_open");
 	return NULL;
   }
@@ -42,6 +54,10 @@ msgSpace * msgSpaceCreate(
 }
 
 
+/*
+ * spaceId : blabla
+ */
+
 msgSpace * msgSpaceOpen(msgSpaceId spaceId){
   int shmId;
   char * nzgId=msgSp2nzgId(spaceId);
@@ -65,7 +81,7 @@ msgSpaceId msgSp2nzgId(msgSpaceId spaceId){
   char * resNzgId;
   int slen;
   slen=strlen(spaceId);
-  resNzgId = (char *)malloc(sizeof(char)*(slen+4));
-  sprintf(resNzgId,"/NZG%s",(char *)spaceId);
+  resNzgId = (char *)malloc(sizeof(char)*(slen+11));
+  sprintf(resNzgId,"/tmp/.nzg-%s",(char *)spaceId);
   return ((msgSpaceId)resNzgId);
 }
diff --git a/src/nzg_global.h b/src/nzg_global.h
index 158818e..e89e4e5 100644
--- a/src/nzg_global.h
+++ b/src/nzg_global.h
@@ -1,3 +1,6 @@
+#ifndef _NZG_GLOBAL
+#define _NZG_GLOBAL 1
+
 #include <unistd.h>  /* POSIX et al */
 #include <stdio.h>
 #include <stdlib.h>
@@ -7,3 +10,4 @@
 #include <sys/mman.h> /* shm_open */
 
 #define PAGESIZE sysconf(_SC_PAGESIZE)
+#endif
diff --git a/src/nzg_iface.h b/src/nzg_iface.h
index c8fb611..a2f7665 100644
--- a/src/nzg_iface.h
+++ b/src/nzg_iface.h
@@ -1,3 +1,7 @@
+#ifndef _NZG_IFACE
+#define _NZG_IFACE 1
+
+
 #include "nzg_global.h"
 #define MSGSPACE_DEFAULT_MODE 0600
 
@@ -12,7 +16,14 @@ typedef struct MsgSpace {
 } msgSpace;
 
 
+typedef char * msgSpaceListElemId;
 
+typedef struct MsgSpaceListElem {
+  void * id;
+  int ownerPid;
+  /* struct msgSpaceListElem * next; */
+  msgSpaceListElemId next;
+} * msgSpaceList, msgSpaceListElem;
 
-
+#endif
 /* */
diff --git a/test/create_delete.c b/test/create_delete.c
index 3dd62f3..33051a2 100644
--- a/test/create_delete.c
+++ b/test/create_delete.c
@@ -3,10 +3,14 @@
 #include "nzg_proto.h"
 
 int main(void) {
- //	msgSpace mS=0;
-  msgSpaceId testId=(msgSpaceId)"test";
-  //msgSpace * mSPAC=msgSpaceCreate(testId,0,0,NULL);
+  //	msgSpace mS=0;
+
+  msgSpaceId testId;
+  msgSpace * mSPAC;
+
+  testId=(msgSpaceId)"test";
+  mSPAC=msgSpaceCreate(testId,0,0,NULL);
   msgSpaceDelete(testId);
-  
+
   return 0;
 }