If I am using a Macintosh computer, what is the alternate to using the F3 key in Editor to open declarations?

If you are using a Macintosh computer, just keep the CTRL key pressed and move the mouse cursor over the header file or function whose declaration or definition you want to open. The hyperlink for that header file or function enables.

Click the hyperlink to switch to the required declaration or definition, as the following figure shows:

By default, the modifier key for hyperlinks in editor is Ctrl; however, you can change the modifier key as per your preference.

1. Select Window > Preferences.

   The Preferences dialog box appears.

2. Type Hyperlink as the filter text to narrow down the list of preferences.
3. Select General > Editors > Text Editors > Hyperlinking.

   The Hyperlinking page appears in the right panel.

   Figure 2. Hyperlinking Page
   
   
   
   
4. Enter the required modifier key in the Default modifier key text box.
5. Click OK.

The modifier key changes, as specified.