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Note If you look at the frmContacts form in the LawTrack Contacts application, you ll see a products subform on the Products tab that has no intervening company contacts subform. This form has some Visual Basic procedures that automatically supply the default company ID for the contact and disallow adding a product if the contact doesn t have a default company defined. You can see how this code works in 23, Automating Your Application with Visual Basic.

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In 7, you learned how to define a subdatasheet for a query. You can do the same thing with forms as long as the forms are saved to be displayed in Datasheet view. The best way to see how this works is to create modified versions of the three forms just built. Start by opening your fsubContactProducts form (or the sample fsubXmplContactProducts form) in Design view. Change the Default View property of the form to Datasheet and save the form as fsubContactProductsDS. Switch to Datasheet view, and your form now looks like Figure 13-22. Notice that several of the columns are much wider than they need to be. If you scroll down to the bottom, you don t see the subtotal that s in the form footer anymore. Also, because the labels for these fields are in the form header (see Figure 13-11) and not attached to their respective controls, you see the actual field names instead of the field captions. Let s not worry about the captions for now, but you should adjust the column widths to be more reasonable. You can do that by double-clicking the dividing line to the right of each column heading. This auto-sizes the columns to the widest data (or column caption) displayed. If the data you see isn t representative of the widest data you might store, you need to adjust the width by hand. You must save the form to preserve this sizing, so choose Save As from the File menu and save the form as fsubContactProductsDS. You can find this form saved as fsubXmplContactProductsDS in the sample database. 502

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Figure 13-22.

Users group receives the permissions needed to read and execute files in this folder (see Figure 9-11).

Switch to Datasheet view, and your form should look like Figure 13-23.

Because the controls on this form have attached labels (see Figure 13-15), the captions from those labels appear as the column headings. Notice that the subdatasheet form has its columns sized as you saved them when you designed the subform. You can resize the columns in 503

You don t need file system permissions to maintain the DNS zone databases using the DNS console or to access DNS server information using a client. Therefore, there is no reason for the Authenticated Users group to have file system permissions. By enabling users to view the DNS data files, you give them an opportunity to gather information about your domain that they could use to stage an attack against the network. You can safely revoke the Authenticated Users group s permissions for this folder, and even limit the Server Operators group to read-only access, if desired.

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Figure 13-23. The form to display company contact information in Datasheet view with a subdatasheet to display products.

The interruption of a DHCP server s functions might not have an immediate effect on your network, but eventually your DHCP clients leases will expire and they will be unable to obtain new ones. Apart from enabling the DHCP Server service itself, there is little you can do to configure DHCP using a GPO. However, there are security mea sures that can help to ensure uninterrupted performance. Denial of service attacks (DoS) constitute one of the biggest threats to DHCP servers. It is relatively simple for an unscrupulous individual to create a script that sends repeated requests for IP address assignments to the server until all the addresses in the scope are depleted. Legitimate clients are then unable to obtain addresses until the

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