diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index fe1bfe7..1bb92cd 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -2871,8 +2871,10 @@
 	    }
 
 #ifdef FEAT_USR_CMDS
-	/* Look for a user defined command as a last resort */
-	if (eap->cmdidx == CMD_SIZE && *eap->cmd >= 'A' && *eap->cmd <= 'Z')
+	/* Look for a user defined command as a last resort.  Let ":Print" be
+	 * overruled by a user defined command. */
+	if ((eap->cmdidx == CMD_SIZE || eap->cmdidx == CMD_Print)
+		&& *eap->cmd >= 'A' && *eap->cmd <= 'Z')
 	{
 	    /* User defined commands may contain digits. */
 	    while (ASCII_ISALNUM(*p))
@@ -5588,6 +5590,7 @@
     int	    compl = EXPAND_NOTHING;
     char_u  *compl_arg = NULL;
     int	    has_attr = (eap->arg[0] == '-');
+    int	    name_len;
 
     p = eap->arg;
 
@@ -5613,6 +5616,7 @@
 	return;
     }
     end = p;
+    name_len = (int)(end - name);
 
     /* If there is nothing after the name, and no attributes were specified,
      * we are listing commands
@@ -5627,6 +5631,13 @@
 	EMSG(_("E183: User defined commands must start with an uppercase letter"));
 	return;
     }
+    else if ((name_len == 1 && *name == 'X')
+	  || (name_len <= 4
+		  && STRNCMP(name, "Next", name_len > 4 ? 4 : name_len) == 0))
+    {
+	EMSG(_("E841: Reserved name, cannot be used for user defined command"));
+	return;
+    }
     else
 	uc_add_command(name, end - name, p, argt, def, flags, compl, compl_arg,
 								eap->forceit);
@@ -9394,7 +9405,7 @@
 ex_ptag(eap)
     exarg_T	*eap;
 {
-    g_do_tagpreview = p_pvh;
+    g_do_tagpreview = p_pvh;  /* will be reset to 0 in ex_tag_cmd() */
     ex_tag_cmd(eap, cmdnames[eap->cmdidx].cmd_name + 1);
 }