How do I lock an IMac with OSX 10.5? (Like Ctrl+Alt+Delete in windows.)

We have one Mac in our domain.  We are in the Financial business and would like to keep things secure.  We lock our PC's with Ctrl+Alt+Delete and then click lock computer.  I have tried many different key combinations and none have worked.  This IMAC is running OSX 10.5.  We are just looking for a simple key combination that will do the same as Ctrl+Alt+Delete on a Windows machine.
cmfcuAsked:
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bolobeoCommented:
You should find the article inspiring:
http://www.macworld.com/article/49080/2006/01/lockscreen.html

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Eoin OSullivanConsultantCommented:
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Shane Russell2nd Line Desktop SupportCommented:
Agree with this section from eoinosullivan: suggestion above :

Locking your screen

Mac OS X also allows you to lock your screen when the screen saver becomes active. You will then have to enter your password to regain access to your computer. To activate this feature, follow the appropriate instructions:
Mac OS X 10.3 and later

   1. From the Apple menu, select System Preferences... .

   2. From the View menu, select Security.

   3. Check the box next to Require password to wake this computer from sleep or screen saver.

To add an item to your menu bar that will allow you to quickly lock the screen and turn on the screen saver, follow these steps:

   1. From your Applications folder, open your Utilities folder, and then open Keychain Access.

   2. In 10.4 and 10.5, from the Keychain Access menu, select Preferences... . Under the General tab, check the box next to Show Status in Menu Bar.

      In 10.3, from the View menu, select Show Status in Menu Bar to check it.
   3. The padlock icon will appear in your menu bar in the upper right corner of your screen. To lock your screen, click this icon, and from the menu that appears, select Lock Screen.

which is this link : http://kb.iu.edu/data/ajqx.html

I think there is also an option to use secure memory somewhere in the system preferences and there is also an option to encrypt or secure your home area.

Depends on how far you want to go.
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