In Delphi, how do I connect the front-end program of the "das" system to the backend)

In Delphi, front-end of DasProgramConnect to the background Application Server
(1) socketconnection:
You only need to install the TCP/IP communication protocol on the front-end computer, but the corresponding socketserverprogram scktsrvr.exe must be available on application server.
(2) dcomconnection:
If the front-end computer system is Win95, you must install DCOM form Win95 (download from Microsoft website). If the system is Win98, me, NT, etc., it already contains DCOM Library
(3) corbaconnection:
Visic broker must be installed, that is, the dedicated corba orb file for Delphi. These files are named orbpas. DLL, cw3240mt. dllorb_r.dll. Copy these files to the system directory of the front-end computer. the same application
Server does not need to be installed.
(4) webconnection:
As long as the front-end computer is installed with the TCP/IP protocol, but the application server must be installed with a set of web servers and httpsrvr. install the DLL file to the Web server virtual directory, and then set the webconnection attribute URL

Point to this virtual path.
Note: No matter which connection component is used, the file ". dll" will be used. Therefore, you must distribute it to the system directory of the front-end computer during packaging.