In case of single main application (EXE)  with multiple modules (DLL) we need activation dialog to be displayed only once and for main application only. There is no need for displaying activation dialog for all DLL modules each time main application is run. This would result in multiple activation dialogs being displayed on each run. 

License handling should be done by main application (EXE) only. DLL modules will share the same license information with main EXE.

In order to accomplish this we need to disable all activation dialog displaying options all DLL modules.

The following options should be turned OFF for DLL modules:

1 If DEMO mode is enabled, the following DEMO settings should be disabled: 

- Display date limitation counter.

- Display execution limitation counter.

- Always display activation dialog box.

2 If limited license is enabled "Display license expiration counter" option in Limited license settings should be disabled:

3 Finally, we need to enable "Special key pop-up option" so that activation dialog is not displayed for license management tasks like license removal or transfer if these are enabled:

- Set "Special key pop-up enabled" option.

- Select all keys: CTRL, Scroll lock, SHIFT, Caps.

- "Display activation dialog on startup if any of special keys is toggled" option should be turned OFF.

See also
How to: Multiple applications - single activation code

Knowledge base
PC Guard: Remote protection