CrtSock - модуль для работы с сокетами в Delphi32

// Server side :
//  - start a server
//  - wait for a client
function StartServer(Port:word):integer;
function WaitClient(Server:integer):integer;
function WaitClientEx(Server:integer; var ip:string):integer;

// Client side :
//  - call a server
function CallServer(Server:string;Port:word):integer;

// Both side :
//  - Assign CRT Sockets
//  - Disconnect server
procedure AssignCrtSock(Socket:integer;
                        Var Input,Output:TextFile);
procedure Disconnect(Socket:integer);

// BroadCasting (UDP)
function StartBroadCast(Port:word):integer;
function SendBroadCast(Server:integer;
                       Port:word; s:string):integer;
function SendBroadCastTo(Server:integer;
                         Port:word;
                         ip,s:string):integer;
function ReadBroadCast(Server:integer; Port:word):string;
function ReadBroadCastEx(Server:integer;
                         Port:word;
                         var ip:string):string;

// BlockRead
function SockAvail(Socket:integer):integer;
function DataAvail(Var F:TextFile):integer;
Function BlockReadsock(Var F:TextFile;
                       var s:string):boolean;

Function send(socket:integer;
              data:pointer;
              datalen,
              flags:integer):integer; stdcall; far;
Function recv(socket:integer;
              data:pchar;
              datalen,
              flags:integer):integer; stdcall; far;