server query:how to get l4d2 all server rules?

[realdreams]

In HLSW, I can see some of the rules like
buddha "0"
coop "0"
deathmatch "1"
decalfrequency "10"
director_afk_timeout "45"
god "0"
l4d2_guncontrol_allowgrenadereplenish "1"
l4d2_guncontrol_allowm60replenish "1"
l4d2_guncontrol_assaultammo "999"
l4d2_guncontrol_autoshotgunammo "999"
l4d2_guncontrol_explosiveammomulti "1"
l4d2_guncontrol_grenadelauncherammo "999"
l4d2_guncontrol_huntingrifleammo "999"
l4d2_guncontrol_incendammomulti "999"
l4d2_guncontrol_m60ammo "999"
l4d2_guncontrol_shotgunammo "999"
l4d2_guncontrol_smgammo "999"
l4d2_guncontrol_sniperrifleammo "999"
l4d2_guncontrol_turnGLintoM60chance "1"
l4d2_guncontrol_version "1.1.2"
l4d2_incappedmedsmunch_delaytime "5.0"
l4d2_incappedmedsmunch_dropmeds "1"
l4d2_incappedmedsmunch_duration "2.0"
l4d2_incappedmedsmunch_version "1.1.7"
l4d2_loot_enabled "1"
l4d2_loot_version "2.3d"
l4d2_WeaponUnlock "0.8.8"
l4d_infected_limit "10"
l4d_killreservation "1"
l4d_maxplayers "21"
l4d_supertank "0"
l4d_survivor_limit "10"
l4d_switchplayers_version "1.4"
l4d_tank_hpmulti "0.25"
l4d_unreserve_full "1"
l4d_unreserve_version "1.1.1"
l4d_votemanager2 "1.5.5"
l4d_XtraHP "0"
left4downtown_version "0.5.1.0"
metamod_version "1.8.4-devV"
mp_allowNPCs "1"
mp_autocrosshair "1"
mp_autoteambalance "1"
mp_c4timer "45"
mp_disable_respawn_times "0"
mp_fadetoblack "0"
mp_falldamage "0"
mp_flashlight "1"
mp_footsteps "1"
mp_forcerespawn "1"
mp_fraglimit "0"
mp_freezetime "6"
mp_friendlyfire "1"
mp_limitteams "2"
mp_maxrounds "0"
mp_roundtime "5"
mp_stalemate_at_timelimit "0"
mp_stalemate_enable "0"
mp_teamlist "hgrunt;scientist"
mp_teamplay "0"
mp_teams_unbalance_limit "1"
mp_timelimit "0"
mp_tournament "0"
mp_weaponstay "0"
mp_winlimit "0"
nextlevel ""
r_AirboatViewDampenDamp "1.0"
r_AirboatViewDampenFreq "7.0"
r_AirboatViewZHeight "0.0"
r_JeepViewDampenDamp "1.0"
r_JeepViewDampenFreq "7.0"
r_JeepViewZHeight "10.0"
r_VehicleViewDampen "1"
sm_advertisements_version "0.5.5"
sm_l4d_fmc_version "1.5.4"
sm_nextmap ""
sm_superversus_version "1.5.4"
sourcemod_version "1.3.5-dev"
survivor_limit "10"
sv_accelerate "5"
sv_airaccelerate "10"
sv_alltalk "0"
sv_bounce "0"
sv_cheats "0"
sv_contact ""
sv_footsteps "1"
sv_friction "4"
sv_gravity "800"
sv_maxspeed "1000.000000"
sv_noclipaccelerate "5"
sv_noclipfriction "4"
sv_noclipspeed "5"
sv_password "0"
sv_rollangle "0"
sv_rollspeed "200"
sv_specaccelerate "5"
sv_specnoclip "1"
sv_specspeed "3"
sv_steamgroup "1580720,964095,554109,554111,883"
sv_stepsize "18"
sv_stopspeed "75"
sv_tags "increased_maxplayers"
sv_voiceenable "1"
sv_wateraccelerate "10"
sv_waterfriction "1"
tauntfrequency "1"
tf_arena_max_streak "5"
tf_arena_preround_time "10"
tf_arena_round_time "0"
tv_enable "0"
tv_password "0"
tv_relaypassword "0"

-----------

gamedir "left4dead2"
gamename "Left 4 Dead 2"
steamid "550"
clientcount "15"
clientmax "21"
botcount "0"
secure "1"


TheQTool - half life query tool 0.1.5 can get pretty much the same except the gray part HLSW can get
http://sourceforge.net/projects/theqtool/


but game-monitor.com Server Variables (http://www.game-monitor.com/left4dead22_GameServer/173.234.33.211:27015/pEgMutation10vs10-Variables.html)
can get even more like
l4d2_WeaponUnlock "0.8.8"

but missing
tf_arena_preround_time "10"
which HLSW can get

I am wondering how does query work and is there a way get all server rules/cvars?

I know http://developer.valvesoftware.com/wiki/Server_queries has a lot of information but I don't understand all of them...

How to control the visibility of some cvars? I believe some servers have set sv_steamgroup but it is just not doesn't show up in server query results.