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diff --git a/explain.tcl b/explain.tcl
index d3049e0..fce1604 100644
--- a/explain.tcl
+++ b/explain.tcl
@@ -1,3 +1,17 @@
+# IR toolkit for tcl/tk
+# (c) Index Data 1995-1998
+# See the file LICENSE for details.
+# Sebastian Hammer, Adam Dickmeiss
+#
+# Explain Driver
+#
+# $Log: explain.tcl,v $
+# Revision 1.4  1998-04-02 14:32:00  adam
+# Minor changes to EXPLAIN driver.
+#
+# Revision 1.3  1998/02/12 13:32:42  adam
+# Updated configuration system.
+#
 
 # Procedure explain-search
 #  Issue search request with explain-attribute set and specific
@@ -8,7 +22,7 @@ proc explain-search-request {target zz category finish response fresponse} {
     ir-set $zz z39
     $zz databaseNames IR-Explain-1
     $zz preferredRecordSyntax explain
-    $zz search "@attrset exp1 @attr 1=1 $category"
+    $zz search "@attrset exp1 @attr 1=1 @attr 2=3 @attr 3=3 @attr 4=3 $category"
 }
 
 # Procedure explain-search-response
@@ -72,7 +86,7 @@ proc explain-present-response {target zz category finish response fresponse} {
 
 # Procedure explain-check-0
 #  Phase 0: CategoryList
-proc explain-check-0 {target finish} {
+proc explain-check-0 {target zz category finish} {
     show-status Explaining 1 0
     show-message CategoryList
     explain-search-request $target z39.categoryList CategoryList $finish \
@@ -161,7 +175,7 @@ proc explain-check-ok {target zz category finish} {
 
 # Procedure explain-refresh
 proc explain-refresh {target finish} {
-    explain-check-0 $target $finish
+    explain-check-0 $target {} {} $finish
 }
 
 # Procedure explain-check