diff --git a/build/api/core/AuthSystemDefault.php b/build/api/core/AuthSystemDefault.php
index 21e0540..58b9ece 100644
--- a/build/api/core/AuthSystemDefault.php
+++ b/build/api/core/AuthSystemDefault.php
@@ -29,24 +29,36 @@
 
 			/* (2) Check CAS
 			---------------------------------------------------------*/
-			if( isset($_SESSION['CAS']['login']) && isset($_SESSION['CAS']['ticket']) ){
+			if( (!isset($_SESSION["isLogged"]) || !$_SESSION["isLogged"]) && isset($_SESSION['CAS']['login']) && isset($_SESSION['CAS']['ticket']) ){
 
-				/* (1) Get professor repo */
+				/* (1) If the user is not logged we try to retrive the list of the linked department*/
 				/** @var professor $prof_repo */
 				$prof_repo = Repo::getRepo('professor');
 
 				/* (2) Get professor with this login */
-				$by_login = $prof_repo->getByLogin($_SESSION['CAS']['login']);
+				$deps = $prof_repo->getLinkedDepartment($_SESSION['CAS']['login']);
+				if(is_array($deps)){
+					$_SESSION['CurrentDatabase'] = $deps[0]["dbName"];
+					$_SESSION['CurrentDepartementId'] = $deps[0]["idDep"];
 
-				/* (3) If found -> store useful information */
-				if( is_array($by_login) && isset($by_login['idProfesseur']) && isset($by_login['admin']) ){
+					Repo::switchDatabase($_SESSION['CurrentDatabase']);
 
-					$_SESSION['CAS']['admin'] = (bool) $by_login['admin'];
-					$_SESSION['CAS']['id']    = (int)  $by_login['idProfesseur'];
+					$by_login = $prof_repo->getByLogin($_SESSION['CAS']['login']);
 
-				/* (4) If no login found -> remove CAS auth */
-				}else
+					/* (3) If found -> store useful information */
+					if( is_array($by_login) && isset($by_login['idProfesseur']) && isset($by_login['admin']) ){
+
+						$_SESSION['CAS']['admin'] = (bool) $by_login['admin'];
+						$_SESSION['CAS']['id']    = (int)  $by_login['idProfesseur'];
+						$_SESSION["isLogged"] 	  = true;
+
+						/* (4) If no login found -> remove CAS auth */
+					}else
+						$_SESSION['CAS'] = [];
+				}else{
 					$_SESSION['CAS'] = [];
+				}
+
 
 			}
 
diff --git a/build/database/core/DatabaseDriver.php b/build/database/core/DatabaseDriver.php
index 080fd09..391e0ed 100755
--- a/build/database/core/DatabaseDriver.php
+++ b/build/database/core/DatabaseDriver.php
@@ -126,12 +126,14 @@
 					$conf[$label]['local']['debug'] = false;
 				}
 
-				self::$instance[$label] = new DatabaseDriver($conf[$label]['local']['host'], $conf[$label]['local']['dbname'], $conf[$label]['local']['user'], $conf[$label]['local']['password'],$conf[$label]['local']['debug']);
-				/* (2) If Remote -> instanciates with Remote configuration */
-				// else
-				// 	self::$instance[$label] = new DatabaseDriver($conf[$label]['remote']['host'], $conf[$label]['remote']['dbname'], $conf[$label]['remote']['user'], $conf[$label]['remote']['password']);
+				if(isset($_SESSION['CurrentDatabase']) && is_string($_SESSION['CurrentDatabase'])){
+					$conf[$label]['local']['dbname'] = $_SESSION['CurrentDatabase'];
+				}
 
-				return true;
+				self::$instance[$label] = new DatabaseDriver($conf[$label]['local']['host'], $conf[$label]['local']['dbname'], $conf[$label]['local']['user'], $conf[$label]['local']['password'],$conf[$label]['local']['debug']);
+
+
+				return true ;
 
 			}catch(\Exception $e){
 
diff --git a/build/database/core/Repo.php b/build/database/core/Repo.php
index d5d86f3..96fdd2e 100644
--- a/build/database/core/Repo.php
+++ b/build/database/core/Repo.php
@@ -77,6 +77,10 @@
 			return static::$driver->isDebugEnabled();
 		}
 
+		public static function switchDatabase(string $dbName){
+			return static::$driver->pdo()->prepare("USE $dbName")->execute();
+		}
+
 
 
 
diff --git a/build/database/repo/professor.php b/build/database/repo/professor.php
index 98df637..298c246 100644
--- a/build/database/repo/professor.php
+++ b/build/database/repo/professor.php
@@ -27,7 +27,7 @@ class professor extends Repo_i {
 	* @return prof_id<int>				The professor's UID (or -1 on error)
 	*
 	---------------------------------------------------------*/
-	public function create(string $lastName, string $firstName, int $category, $hoursToDo = 0, $initials = "", $isAdmin = false , $casLogin = "" ) : ?int{
+	public function create(string $lastName, string $firstName, int $category, int $hoursToDo = 0, ?string $initials = null , bool $isAdmin = false , ?string $casLogin = null ) : ?int{
 
 		/* (1) Prepare Statement */
 		$st = $this->pdo->prepare("INSERT INTO
@@ -45,12 +45,30 @@ class professor extends Repo_i {
 			':cat'       => $category
 		]);
 
+		$profId = $this->pdo->lastInsertId();
+
+		/* (3) synchroize the meta database */
+		if(!is_null($casLogin)){
+			$st = $this->pdo->prepare("INSERT IGNORE INTO meta_vhost.casUser(casLogin, firstName, lastName) VALUE (:casLogin,:firstName,:lastName)");
+			$st->execute([
+				"casLogin" => $casLogin,
+				"firstName" => $firstName,
+				"lastName" => $lastName
+			]);
+
+			$st = $this->pdo->prepare("INSERT INTO meta_vhost.linkedDep(departement_iddepartement, casUser_casLogin) VALUE (:idDep,:casLogin)");
+			$st->execute([
+				"idDep" => $_SESSION['CurrentDepartementId'],
+				"casLogin" => $casLogin
+			]);
+		}
+
 		/* (3) Manage error */
 		if( !$success )
 			return NULL;
 
 		/* (4) Return inserted ID */
-		return $this->pdo->lastInsertId();
+		return $profId;
 
 	}
 
@@ -97,6 +115,37 @@ class professor extends Repo_i {
 
 	}
 
+	public function getLinkedDepartment(string $casLogin) : ?array{
+
+		/* (1) Prepare Statement */
+		$st = $this->pdo->prepare("SELECT d2.iddepartement idDep, d2.label labelDep, d2.databaseName dbName
+											FROM meta_vhost.casUser
+											JOIN meta_vhost.linkedDep D ON casUser.casLogin = D.casUser_casLogin
+											JOIN meta_vhost.departement d2 ON D.departement_iddepartement = d2.iddepartement
+											WHERE casLogin = :caslogin");
+
+		/* (2) Check if statement error */
+		if( is_bool($st) )
+			return NULL;
+
+		/* (3) Bind params and execute statement */
+		$success = $st->execute([ ':caslogin' => $casLogin ]);
+
+		/* (4) Manage error */
+		if( !$success )
+			return NULL;
+
+		/* (5) Get data */
+		$fetched = $st->fetchAll();
+
+		/* (6) Return NULL on no result */
+		if( $fetched === false )
+			return NULL;
+
+		/* (7) Return data */
+		return $fetched;
+	}
+
 
 
 
@@ -140,7 +189,31 @@ class professor extends Repo_i {
 		$st = $this->pdo->prepare($sql_rq);
 
 		/* (5) Return execution success */
-		return $st->execute($bind_param);
+		$success = $st->execute($bind_param);
+
+		$prof = $this->get($id);
+		if($success && !is_null($prof[0]["casLogin"])){
+			//try to get the user
+			$st = $this->pdo->prepare("SELECT * FROM meta_vhost.casUser WHERE casLogin = :casLogin");
+			$st->execute([
+				"casLogin" => $prof[0]["casLogin"]
+			]);
+
+			//is the user does not already exists, we create it
+			if(!is_array($st->fetch())){
+				$st = $this->pdo->prepare("INSERT INTO meta_vhost.casUser(casLogin, firstName, lastName)
+												VALUE(:casLogin,:firstName,:lastName)");
+			}else{
+				$st = $this->pdo->prepare("UPDATE meta_vhost.casUser SET casLogin = :casLogin,firstName = :firstName, lastName = :lastName ");
+			}
+			$st->execute([
+				"firstName" => $prof[0]["firstName"],
+				"lastName" => $prof[0]["lastName"],
+				"casLogin" => $prof[0]["casLogin"]
+			]);
+		}
+
+		return $success;
 
 	}
 
@@ -358,11 +431,25 @@ class professor extends Repo_i {
 	---------------------------------------------------------*/
 	public function delete(int $id) : bool{
 
+		//we have to store the professor to synchronize the meta database later
+		$prof = $this->get($id);
+
 		/* (1) Prepare statement */
 		$st = $this->pdo->prepare("DELETE FROM `Professeur` WHERE `idProfesseur` = :id");
 
 		/* (2) Return the execution status */
-		return $st->execute([ ':id' => $id ]);
+		$success =  $st->execute([ ':id' => $id ]);
+
+		if($success){
+			//delete the association
+			$st = $this->pdo->prepare("DELETE FROM meta_vhost.linkedDep WHERE casUser_casLogin = :casLogin AND departement_iddepartement = :idDep");
+			$st->execute([
+				"casLogin" => $prof[0]["casLogin"],
+				"idDep" => $_SESSION['CurrentDepartementId']
+			]);
+		}
+
+		return $success;
 
 	}