OpenOffice.org OpenOffice - 3.0 User's Guide download pdf (Page 243)

detailed description of how to get and manage a certificate, and

signature validation, see “Using Digital Signatures” in the OOo Help.

To sign a document:

1) Choose File > Digital Signatures.

2) If you have not saved the document since the last change, a

message appears. Click Yes to save the file.

3) After saving, you see the Digital Signatures dialog box. Click Add

to add a public key to the document.

4) In the Select Certificate dialog box, select your certificate and

click OK.

5) You see again the Digital Signatures dialog box, where you can

add more certificates if you want. Click OK to add the public key

to the saved file.

A signed document shows an icon in the status bar. You can

double-click the icon to view the certificate.

Opening and saving a PowerPoint file

OpenOffice.org’s Impress file format is highly compatible with

Microsoft’s PowerPoint format. You can open a PowerPoint

presentation in Impress, edit it, then save it in its original PowerPoint

format or in Impress format. You can also create a new presentation in

Impress and save it as a PowerPoint file, for sharing your presentation

with those who have yet to discover OpenOffice.org.

Saving an Impress file as a PowerPoint file

1) Choose File > Save As from the menu bar.

2) Select the location where you want the PowerPoint file saved and

type a name for the file.

3) Under

File type

, choose Microsoft PowerPoint 97/2000/XP

(.ppt).

4) Click Save. If you have the “Warn when not saving in ODF or

default format” option set in Options > Load/Save > General,

the message shown in Figure 196 appears. Click Keep Current

Format to confirm that you want to save the file in Microsoft

PowerPoint format. You can deselect the “Ask when not saving in

ODF format” checkbox to not show the message again unless you

re-enable it in the Options.

Chapter 10 Printing, e-mailing, exporting, and saving slide shows 243

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OpenOffice.org OpenOffice - 3.0 User's Guide Page 243