--- ray/src/hd/rhdisp.h	1997/11/20 18:04:59	3.4
+++ ray/src/hd/rhdisp.h	1998/01/04 18:37:11	3.10
@@ -8,20 +8,25 @@
 
 				/* display requests */
 #define DR_NOOP		0		/* to release from vain DR_ATTEN */
-#define DR_BUNDLE	1		/* bundle request */
+#define DR_BUNDLE	1		/* lone bundle request */
 #define DR_ATTEN	2		/* request for attention */
 #define DR_SHUTDOWN	3		/* shutdown request */
 #define DR_NEWSET	4		/* new bundle set */
 #define DR_ADDSET	5		/* add to current set */
-#define DR_DELSET	6		/* delete from current set */
+#define DR_ADJSET	6		/* adjust set quantities */
+#define DR_DELSET	7		/* delete from current set */
+#define DR_KILL		8		/* kill rtrace process(es) */
+#define DR_RESTART	9		/* restart rtrace */
+#define DR_CLOBBER	10		/* clobber holodeck */
 
 				/* server responses */
-#define DS_BUNDLE	7		/* computed bundle */
-#define DS_ACKNOW	8		/* acknowledge request for attention */
-#define DS_SHUTDOWN	9		/* end process and close connection */
-#define DS_ADDHOLO	10		/* register new holodeck */
-#define DS_STARTIMM	11		/* begin immediate bundle set */
-#define DS_ENDIMM	12		/* end immediate bundle set */
+#define DS_BUNDLE	32		/* computed bundle */
+#define DS_ACKNOW	33		/* acknowledge request for attention */
+#define DS_SHUTDOWN	34		/* end process and close connection */
+#define DS_ADDHOLO	35		/* register new holodeck */
+#define DS_STARTIMM	36		/* begin immediate bundle set */
+#define DS_ENDIMM	37		/* end immediate bundle set */
+#define DS_OUTSECT	38		/* render from outside sections */
 
 /*
  * Normally, the server channel has priority, with the display process
@@ -41,3 +46,17 @@ typedef struct {
 	int2	type;		/* message type */
 	int4	nbytes;		/* number of additional bytes */
 } MSGHEAD;		/* message head */
+
+/*
+ * The display process is started with three arguments.  The first argument
+ * is the short name of the holodeck file, appropriate for window naming, etc.
+ * The second and third arguments are the file descriptor numbers assigned to
+ * the server's standard output and input, respectively.  The stdin and stdout
+ * of the display process are used for normal communication with the server,
+ * and are connected to pipes going each way.  It is entirely appropriate
+ * for the display process to borrow the server's stdin and stdout for reading
+ * and writing user commands from the list in rhdriver.h.  If standard input
+ * is not available for reading, then a descriptor of -1 will be passed.
+ * The standard output will always be available for writing, though it
+ * may go to /dev/null.
+ */