>>Hello.
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>>Are there some experts tell me the difference between client server and application server ?
>>
>>Sunny
>
>I consider a client/server application an application whose executable is located on a local drive and the data on a server. Some only consider client/server if server is something like Oracle, SQL-Server, Sybase, etc. An application server would have the application running on the server for all users.
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>Some companies (not MS) offer concurrent-use licenses where an application such as Lotus can be installed on a server for use by a limited number of users. The software, at installation, is programmed with a set number of concurrent users - say 10 users. This means if 10 users are using Lotus, the 11th user will get a message that Lotus can not be launched until someone exits application. This is a big money savings by having this kind of application server.
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>MS does not do this because they make more $$$ by requiring a separate license for each user.

True client/server, in the simplest of terms, means that an instance of the front-end software (VC++, VFP, VB) is running on the client and an instance of the database (Oracle, SQL-Server, even VFP) is running on the server. Typical VFP installations are not true client/server but rather file/server or data/server applications. One instance of the application is executing and the data simply resides on a LAN somewhere. VFP can create an instance on the server, but then you'd need VFP's ODBC driver loaded to access the data and most installations probably do not do this. Read Scot Beckers article in the UT Knowledgebase for more on client/server and VFP.

Steve Despres