JPH0460741A - Network system - Google Patents

Abstract

PURPOSE:To facilitate a cooperative work and to prevent the operation of an outsider by providing an access storage part and a data updating part and restricting an access right for a display device in a display controller controlling the display of plural work stations. CONSTITUTION:The display controller 21 is provided with a video memory 23, a control part 22, the access storage part 24, etc. The video memory 23 stores the display data displayed in the display of the work stations 28 and 29. The access storage part 24 stores the input access right and the output access right from the work stations 28 and 29 together with ID of respective work stations 28 and 29. The content can be updated by the data updating part 26. The control part 22 refers to the access storage part 24 against an input/output request from the work stations 28 and 29. When access is available the input for the video memory 23 and the transfer of data on the video memory 23, etc., are executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a network system comprised of a plurality of workstations connected via a network and capable of exchanging data with each other.

[Conventional technology]

One of the ways to use a network system in which multiple workstations are connected via a network is to use the workstation's display like a blackboard to collaborate during meetings via the network. has been done. In this case, the same common screen is displayed on each workstation, and information input from each workstation is displayed on this common screen. In this case, even if the workstations are located far apart from each other, the attendees can write directly on the blackboard and other attendees can view the writing.

FIG. 4 shows an example of the configuration of a conventional network system, in which a plurality of workstations 12, 13 are connected via a network 14 to a common display control device 11 in which accessible workstations are registered in advance. ing. and multiple workstations 12.1
Each workstation 12 receives input from 3.
．． The same display is displayed on the 13 displays. That is,
When a display request is made from another workstation, the display data of the image displayed on the display window of one workstation is transferred to the network 14.
are sent to the other workstations via

[Problem to be solved by the invention]

However, if unlimited access is allowed from each workstation 12, 13, there are problems such as the data in the video memory in the display control device 11 being inadvertently rewritten or unqualified users viewing the data. .

The present invention was devised to solve the above-mentioned problems, and by restricting access rights to the display control device, input and output requests to the display control device can be processed independently. The purpose is to

[Means to solve the problem]

The network system of the present invention is a network system in which a plurality of workstations are connected via a network, and includes display means for displaying the same content on the display windows of at least two workstations, and access rights for the displayed workstations. and setting means for setting.

[Effect]

In the present invention, access rights for human output to display windows are set for each workstation. Then, when there is an input or output request to the display window, the set access rights are referenced.
Input/output processing is performed according to the authority granted to the requester.

〔Example〕

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, features of the present invention will be specifically described based on examples with reference to the drawings.

In the figure, reference numeral 21 indicates a display control device as a whole, and a control section 22. Video memory 23. Access storage section 24
1 communication control unit 25. It includes a data update section 26 and the like.

This display control device 21 is connected to a plurality of workstations 28, 29, etc. via a network 27. The video memory 23 of the display control device 21 stores display data to be displayed on the displays of the workstations 28 and 29. The access storage unit 24 stores input access rights and output access rights from the workstations 28, 29, etc., along with workstation IDs (identification codes) assigned to each workstation, as shown in Table 1. , its contents can be updated by the data update unit 26.

The first table control unit 22 refers to the access storage unit 24 for input/output requests sent from the workstations 28, 29, etc. through the communication control unit 25, and processes the request if it is accessible. The data is input to the video memory 23, or the data in the video memory 23 is transferred to the requested workstation via the communication control unit 25.

Next, regarding the input processing operation of the above-mentioned display control device,
This will be explained with reference to the flowchart in FIG.

When the control unit 22 receives the input request, the access storage unit 24
It is checked whether the requested workstation can be input by referring to (step 41).

If input is possible, the requested input processing is performed and the data in the video memory 23 is updated (step 42).

If not, the input request is canceled (step 43).Next, the operation of the output processing will be explained with reference to the flowchart of FIG. 3.

When the control unit 22 receives the output request, the control unit 22 outputs the access storage unit 24.
It is checked whether the requested workstation is capable of outputting by referring to (step 51).

If output is possible, the requested output processing is performed and the data in the video memory 23 is transferred to the requested workstation (step 52). Otherwise, the output request is canceled (step 53).

By the above process, for example, the workstation 29
When accessed from , display on the display is possible, but input to the video memory 23 is not permitted.

In the above-described embodiment, the data update section 26 is provided independently, but the processing of the data update section 26 is controlled by i11.
It can also be carried out in section 22. In addition, the access storage unit 24
For registration, not only the workstation ID but also the user ID can be used, and it is also possible to register using both.

〔Effect of the invention〕

As described above, according to the present invention, access rights to the display window are set for each workstation, so when performing collaborative work by displaying the same image on the display window of each workstation, it is possible to write and reading can be limited in stages. This allows both writing and reading to be performed only by users directly involved in the work, and the work is not hindered by writing from unauthorized outsiders. Further, a user who is an outsider and is interested in the collaborative work can check the progress status of the collaborative work.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a configuration example of a display control device according to the present invention, Fig. 2 is a flowchart showing an example of the flow of input processing in the display control device, and Fig. 3 is a flow chart of output processing in the display control device. FIG. 4 is a block diagram illustrating an outline of a conventional display control method. 11.21: Display control device 12, 13.28.29: Workstation 14.
27: Network 22: Control unit 23: Video memory 24: Access storage unit 25; Communication control unit 26: Data update unit

Claims (1)

[Claims] 1. In a network system in which a plurality of workstations are connected via a network, a display means for displaying the same content on the display windows of at least two workstations, and a setting means for setting access rights of the displayed workstations. A network system comprising: