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+NIC 9929                                                Ira Cotton
+NWG/RFC #336                                            Mitre
+Level 0 Graphic Input Protocol                          5 May 1972
+
+        Level 0 Graphic Input Protocol
+
+           At its meeting on April 16-18 the network Graphics working
+           group began to consider the definition of levels of protocol
+           for graphic Input Protocol.  The following describes the
+           Level 0 graphics input protocol.
+
+           The philosophy guiding the establishment of this protocol is
+           the same as suggested in RFC #178, "Network Graphic Attention
+           Handling." Briefly, all input will be described by type,
+           origin, and length, followed by the actual data.
+
+           Only two types of input are defined at Level 0: text and
+           simple position.
+
+              Text Input
+
+                  Text input will be conveyed in the following format:
+
+                   TEXTIN : DEVICE : COUNT: Text String
+
+
+
+                 TEXTIN is a protocol code indicating the nature of this
+                 input string.  For the present this code is defined to
+                 be 1.
+
+                 DEVICE is a code indicating the device from which the
+                 input originated.  The following codes are presently
+                 defined:
+
+                      0 - unspecified device
+                      1 - primary keyboard
+                      2 - tablet
+                      3 - mouse
+                      4 - joystick
+                      5 - lightpen
+                      6 - cursor
+                      7 - keyset
+                      8 - mouse & keyset
+
+
+
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+
+                                                                [Page 1]
+
+NIC 9929
+NWG/RFC# 336
+Level 0 Graphic Input Protocol
+
+                 Count is an integer number indicating the number of
+                 characters (bytes) which follow.
+
+                 Text String is a string of "Count" bytes of characters
+                 in network ASCII.
+
+              Position Input
+
+                   Simple position data will be conveyed in the
+              following format:
+
+                   POSIT : DEVICE : COUNT : x : y
+
+                 POSIT is a protocol code indicating that this string
+                 contains position data.  For the present this code is
+                 defined to be 2.
+
+                 DEVICE is a code indicating the input device on which
+                 this data was generated.  The codes are as defined
+                 above.
+
+                 COUNT is an integer number indicating the number of
+                 bytes of data which follow.  This includes data for
+                 both x and y coordinates.  Thus, the number of bytes of
+                 x coordinate data is COUNT divided by 2.  At level 0,
+                 COUNT should always be 4, since at this level all
+                 coordinates are expressed in 2 bytes of data.
+
+                 x and y coordinate data are represented as signed
+                 fractions in the same fashion that position data is
+                 represented in the Level 0 graphic output protocol.
+
+           It should be emphasized that input data from a level 0
+           graphics user which is not in a format described above should
+           be sent on a different link than the graphics input link.
+           This may be desirable for certain applications to avoid the
+           overhead of the protocol.
+
+       [ This RFC was put into machine readable form for entry ]
+       [ into the online RFC archives by BBN Corp. under the   ]
+       [ direction of Alex McKenzie.                   12/96   ]
+
+
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+                                                                [Page 2]
+