diff --git a/sats/main b/sats/main
index 1eaf0ad..4c1bb89 100644
--- a/sats/main
+++ b/sats/main
@@ -12,9 +12,15 @@ test $# -lt 1 && echo -e "ERR: Missing argument\n\n\tSATS_ID\tThe id for the bas
 
 # (2) Start server in background (keep PID)
 #--------------------------------------------------------#
-# (1) Start server #
-$ROOT/com/launch sats $1 44441 44440 9999&
-SERV_PID=$!;
+# (1) Start server (if not already done) #
+if [ ! -f $ROOT/sats/.lock ]; then
+
+	$ROOT/com/launch sats $1 44441 44440 9999&
+	SERV_PID=$!;
+
+	touch $ROOT/sats/.lock;
+
+fi;
 
 
 
@@ -48,6 +54,10 @@ on_exit(){
 	echo 'sats.server.kill';
 	kill -9 $SERV_PID 2>/dev/null;
 
+	## {4} Delete lock file ##
+	echo 'sats.server.lock.delete';
+	rm $ROOT/sats/.lock 2>/dev/null;
+
 	exit 0;
 }