DEMO

    HLTV demo files are like normal recorded games in Half-Life, but you can
    choose any view point, view mode or player to chase during replay. To play
    back a HLTV demo, a HLTV proxy is not needed. Just start Half-Life and type
    in console "playdemo <demoname>" or "viewdemo <demoname>" (viewdemo offers
    more options during playback like fast forward/backward, pause &
    slowmotion). To record a HLTV demo, connect the proxy to a game server (see
    last chapter) and type in console:
      
    >record <name>
 
    All games will be recorded after issuing this command. The demo files will
    be saved in the current Mod directory, e.g. \cstrike. All demo files have a
    special naming convention <name>-<YYMMDDhhmm>-<map>.dem, including the
    given name, date/time and map name. Demo files record the same data as send
    to spectator clients. That means also, the demo file records the game with
    the same delay as used for spectators. To verify, that a demo file is
    recorded use the "status" command. The recording may be stopped with
    "stoprecording".
  
    Sometimes a HLTV broadcast is not wanted and the HLTV proxy is only used
    to record a demo file. In this case, some HLTV settings should be made to
    gain optimal recording results:
  
    >maxclients 0   // don't allow any spectator clients
    >delay 0        // no game stream delay
    >rate 10000     // maximum data rate
    >updaterate 20  // standard update rate
    >nomaster 1     // don't register at master servers