OK, it won't work, probably, but it's a first try.

boxmox/experiment.py

@@ -112,6 +112,8 @@ class Experiment:
         #: Log file of the last run
         self.lastLog     = None
 
+        self.pid         = None
+
         self.__new()
 
         #: Namelist
@@ -184,11 +186,12 @@ class Experiment:
 
         return mech
 
-    def run(self, dumbOutput=False):
+    def run(self, dumbOutput=False, asynchronous=False):
         '''
         Run BOXMOX experiment
 
         :param bool dumbOutput: Only load references to output files, instead of loading data? (faster, but not usable for analysis)
+        :param bool asynchronous: Run asynchronous?
         '''
         self.namelist.write(os.path.join(self.path, 'BOXMOX.nml'))
 
@@ -200,11 +203,13 @@ class Experiment:
         os.chdir(self.path)
 
         try:
-            p = s.Popen("./" + self.mechanism + ".exe", stdout=s.PIPE, bufsize=1)
-            p.wait() # wait for the subprocess to exit
+            self.pid = s.Popen("./" + self.mechanism + ".exe", stdout=s.PIPE, bufsize=1)
+            if asynchronous:
+                return
+            self.pid.wait() # wait for the subprocess to exit
 
             self.lastLog = []
-            for line in iter(p.stdout.readline, b''):
+            for line in iter(self.pid.stdout.readline, b''):
                 self.lastLog.append(line.replace('\n',''))
 
         except Exception as e:
@@ -293,6 +298,8 @@ class ExperimentFromExample(Experiment):
 
         self.lastLog     = None
 
+        self.pid         = None
+
         self.input       = {}
         self.output      = {}
 
@@ -333,6 +340,8 @@ class ExperimentFromExistingRun(Experiment):
 
         self.lastLog     = None
 
+        self.pid         = None
+
         self.input       = {}
         self.output      = {}