diff --git a/src/arachne.c b/src/arachne.c
index d395837..a6cf96c 100644
--- a/src/arachne.c
+++ b/src/arachne.c
@@ -15,8 +15,13 @@
 #include "arachne.h"
 
 static System sys;
-static Protocol INTRUDER;	// Pointers, to be set by the Init
-static Role I_GOAL;		// Same here.
+Protocol INTRUDER;	// Pointers, to be set by the Init
+Role I_GOAL;		// Same here.
+Role I_TEE;
+Role I_SPLIT;
+Role I_TUPLE;
+Role I_ENCRYPT;
+Role I_DECRYPT;
 
 #ifdef DEBUG
 static char *explanation;	// Pointer to a string that describes what we just tried to do
@@ -46,10 +51,35 @@ int iterate ();
 void
 arachneInit (const System mysys)
 {
+  Roledef rd = NULL;
+
+  void add_event (int event, Term message)
+    {
+      rd = roledefAdd (rd, event, NULL, NULL, NULL, message, NULL);
+    }
+  Role add_role (const char *rolename)
+    {
+      Role r;
+
+      r = roleCreate (makeGlobalConstant (rolename));
+      r->roledef = rd;
+      rd = NULL;
+      r->next = INTRUDER->roles;
+      INTRUDER->roles = r;
+      compute_role_variables (sys, INTRUDER, r);
+      return r;
+    }
+
   sys = mysys;			// make sys available for this module as a global
   /*
    * Add intruder protocol roles
    */
+
+  INTRUDER = protocolCreate (makeGlobalConstant (" INTRUDER "));
+
+  add_event (READ, NULL);
+  I_GOAL = add_role (" I_GOAL ");
+
   return;
 }
 
diff --git a/src/compiler.c b/src/compiler.c
index 3f5fcee..d44e28d 100644
--- a/src/compiler.c
+++ b/src/compiler.c
@@ -33,6 +33,7 @@ Term levelFind (Symbol s, int i);
 Term symbolFind (Symbol s);
 Term tacTerm (Tac tc);
 Termlist tacTermlist (Tac tc);
+Term levelDeclare (Symbol s, int isVar, int level);
 void compute_role_variables (const System sys, Protocol p, Role r);
 
 #define	levelDeclareVar(s)	levelTacDeclaration(s,1)
@@ -101,6 +102,12 @@ compilerInit (const System mysys)
   langcons (CLAIM_Niagree, "Niagree", TERM_Claim);
 }
 
+//! Make a global constant
+Term makeGlobalConstant (const char *s)
+{
+  return levelDeclare (symbolSysConst(s), 0, 0);
+}
+
 //! Clean up afterwards
 void
 compilerDone (void)
diff --git a/src/compiler.h b/src/compiler.h
index 62e85a1..14eb820 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -7,5 +7,7 @@ void compilerDone (void);
 void compile (Tac tc, int maxruns);
 void preprocess (const System sys);
 Term findGlobalConstant (const char *s);
+Term makeGlobalConstant (const char *s);
+void compute_role_variables (const System sys, Protocol p, Role r);
 
 #endif