Added section about client.

TODO

@@ -89,11 +89,6 @@ o  Napsat neco o tom, jak filtry debugovat -- ze existuje trasovani filtru
 o  `filters internally work ...' patri do progdoc.
 o  Vysvetlit nesting a zastinovani.
 o  Nadefinovat, co se stane, kdyz funkce nevrati hodnotu, i kdyz ma.
-o  Typy: tez rici, ze integery se lisi nejen od booleanu, ale take od enumu.
-o  Boolean: TRUE nebo true? U kazdeho typu zminit, jak vypadaji literaly
-   tohoto typu a psat je vzdycky tt fontem.
-o  int: Nadefinovat rozsah a rici, ze preteceni se nekontroluje. Zminit
-   hexadecimalni konstanty.
 o  ip: IPv4/IPv6 nezavisi na verzi BIRDa, nybrz na compile-time konfiguraci.
 o  ip: .mask zminit zvlast mezi specialnimi operatory.
 o  set: lepe vysvetlit matchovani prefixu, ukazat na prikladu.
@@ -102,11 +97,6 @@ o  bgpmask: vysvetlit matchovani.
 o  operations: prejmenovat na `operators', mela by to asi byt tabulka
    operatoru, u kazdeho receno, na jakych typech je definovan a jakeho
    typu je vysledek.
-o  operations: ~ pracuje i na clistech, neni-liz pravda?
-o  Examply by mohly byt krapet smysluplnejsi.
-o  defined(): To, ze undefined attribute cannot be accessed, by melo byt
-   rozhodne receno nekde jinde (v uvodu sekce) -- vzdyt u defined samotneho
-   to mozne je.
 o  attributes: nemyslim, ze jsou vsechny -- co treba scope a preference?
 o  print: a coz takhle printn apod.?
 o  Mezi prikazy nikde neni zminen napriklad accept a reject.

doc/bird.sgml

@@ -106,6 +106,8 @@ configuration primitives, <cf> is fragment of configuration within normal
         vi /usr/local/etc/bird.conf
 </code>
 
+<p>You can use <tt>./configure --help</tt> to get list of configure options.
+
 <sect1>About routing tables
 
 <p>Bird has one or more routing tables. Each routing table contains
@@ -231,6 +233,18 @@ protocol rip {
 						  
 </descrip>
 
+<sect1>Client
+
+<p>You can use command-line client <file>birdc</file> to talk with
+running BIRD. Communications is done using <file/bird.ctl/ unix domain
+socket (unless changed with <tt/-s/ option given to both server and
+client). Client can do simple actions such as enabling/disabling
+protocols, telling BIRD to show various information, telling it to
+show routing table filtered by any filter, or telling bird to
+reconfigure. Press <tt/?/ at any time to get online help. Option
+<tt/-v/ can be passed to client, telling it to dump numeric return
+codes.
+
 <sect>Filters
 
 <sect1>Introduction
@@ -306,7 +320,7 @@ is rejected.
 <sect1>Data types
 
 <p>Each variable and each value has certain type. Unlike C, filters distinguish between integers and
-booleans (that is to prevent you from shooting in the foot).
+booleans and between integers and enums (that is to prevent you from shooting in the foot).
 
 <descrip>
 	<tag/bool/ this is boolean type, it can have only two values, <cf/TRUE/ and
@@ -314,7 +328,7 @@ booleans (that is to prevent you from shooting in the foot).
 	  statements.
 
 	<tag/int/ this is common integer, you can expect it to store signed values from -2000000000
-	  to +2000000000.
+	  to +2000000000. Overflows are not checked.
 
 	<tag/pair/ this is pair of two short integers. Each component can have values from 0 to
 	  65535. Constant of this type is written as <cf/(1234,5678)/.
@@ -406,12 +420,13 @@ if 1234 = i then printn "."; else { print "*** FAIL: if 1 else"; }
 
 <sect1>Route attributes
 
-<p>Filter is implicitly passed route, and it can access its attributes, just like it accesses variables.
+<p>Filter is implicitly passed route, and it can access its
+attributes, just like it accesses variables. Access to undefined
+attribute results in runtime error; you can check if attribute is
+defined using <cf>defined( <m>attribute</m> )</cf> syntax.
+
 
 <descrip>
-	<tag>defined( <m>attribute</m> )</tag>
-	returns TRUE if given attribute is defined. Access to undefined attribute results in runtime error.
-
 	<tag/<m/prefix/ network/
 	network this route is talking about.