PWB allows you to assign functions and macros to almost any key combination. However, some keys have a fixed meaning in certain circumstances or operating environments. PWB lists these key as available keys in the Key Assignments dialog box, and PWB allows you to assign a command to the key. However, when the circumstance holds, or you are running PWB in a specific environment, certain keys have a fixed meaning that overrides any assignment that you make.
Help Window
In the Help window, the following keys have a fixed meaning:
| Key | Meaning |
| ESC | Close the Help window |
| TAB | Move to next hyperlink |
| SHIFT+TAB | Move to previous hyperlink |
| ENTER | Activate current hyperlink |
| NUMENTER | Activate current hyperlink |
| SHIFT+ENTER | Activate current hyperlink |
| SHIFT+NUMENTER | Activate current hyperlink |
| SPACE | Activate current hyperlink |
Dialog Boxes
In dialog boxes, all keys have predetermined meanings. Your assignments have no effect when a dialog box is displayed. In particular, note the following keys:
| Key | Meaning |
| ESC | Choose Cancel |
| ENTER | Choose the active command button |
| F1 | Choose Help |
| TAB | Move to the next option or command |
| SHIFT+TAB | Move to the previous option or command |
| SPACE | Toggle active option |
| CTRL+P | When used in a text box, inserts the next key as a literal value. Use this key to type a literal tab character. |
The Text Argument dialog box is an exception. All keys except ESC (Cancel) and F1 (Help) have their assigned meaning.
Microsoft Windows
When running PWB under Windows, some keys are reserved for use by Windows. You can override Windows' use of these keys by setting options in a PIF file.
| Key | Default Meaning in Windows |
| ALT+ESC | Switch to the next window in Windows |
| CTRL+ESC | Switch to the Windows Task Manager |
| ALT+TAB | Switch to the next application |
| ALT+SPACE | Activate the current window's system menu |
| ALT+ENTER | Shift application between full screen and window |