Scripting/Squirrel/Functions/Player.SpectateTarget
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Some information may be old/missing
Example
function onPlayerCommand( player, cmd, text ) { if ( cmd == "spectate" ) { local plr = FindPlayer( text ); if ( !plr ) MessagePlayer( "Error: Player '" + text + "' is not online.", player ); else player.SpectateTarget = plr; } }