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The first DOS Requester module loaded is called VLM.EXE, the Virtual Loadable Module memory and module manager. Figure 2 illustrates the modular architecture of the DOS Requester. The DOS Requester works with DOS versions 3.1 or greater. The DOS Requester is a collection of individual modules that encompass much of the functionality that exists in NETX.COM and add other capabilities as well. The NetWare shell supports up to eight server connections, so drive mappings can be to any of eight different servers. These drive mappings are used to help designate where a DOS request needs to go. The shell places the drive information into the Drive Connection ID table, Drive Flag table, and Drive Handle tables. When you log in to a file server, the shell stores the login information and drive mappings that come from the execution of system and user login scripts. These tables are similar to tables that DOS keeps.įigure 1: The NetWare shell intercepts application requests and determines whether they are for DOS or for the network. To keep track of attached file servers and their respective network drives, the shell maintains a number of internal tables: the Drive Connection ID table, the Drive Flag table, the Drive Handle table, the File Server Name table, and so forth. When the server sends a reply, the shell hands the data back to the application.įigure 1 illustrates how the NetWare shell passes information between applications, DOS, and the network. IPX takes this packet and sends the request to the server. The shell then converts the request from a DOS request to an NCP request, and the network location information is used to build an IPX packet. If the file is on a network drive, the request goes through the shell's connection table, which defines information about the server and its location on the network. If the request is for a local file, the shell passes the call to DOS and allows DOS to complete the request. The NetWare shell intercepts the call and determines if the requested file is on a local drive or on a network drive. ![]() To read a data file, for example, an application makes an Int 21h call to DOS to open a file with the indicated name. These include Interrupts 21h, 24h, and 17h. When the NetWare shell is loaded on a workstation, the shell intercepts activities on certain interrupts that applications use to talk to DOS services. The NetWare Shell (NETX.COM) acts as an intermediary between application requests and DOS or the network. To understand the difference between the DOS Requester and the NetWare shell, we first need to review the architecture and function of each. SIMPLE LSL HTML COMPILER V 1.0 HOW TOIt ends with a discussion of how to log in to a NetWare 4.0 network and use some of the new client utilities. SIMPLE LSL HTML COMPILER V 1.0 INSTALLIt then tells how to install and configure the DOS Requester, using parameters in the NET.CFG file. This AppNote first explains how the DOS Requester works and what the different Virtual Loadable Modules (VLMs) do. The DOS Requester takes the place of the NETX.COM shell and offers a more flexible interface into NetWare 4.0 as well as NetWare 3.x and below. SIMPLE LSL HTML COMPILER V 1.0 SOFTWAREWith the release of NetWare 4.0, Novell introduced new NetWare DOS client software known as the DOS Requester.
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