Hello again Roman,
No, the path to the menu is irrelevant. Each command has a unique name. This means that even if the command is moved to another menu (by configuration files, for instance), the code does not change.
The array is used so that you can pass more than one command to the Fcodes ( ) function at one time. If you would also want to save the document after applying the master pages, you could add the Fcode for "SaveDocument" to the array. Then passing the array of codes to the Fcodes ( ) function will cause all those commands to be executed one after the other. This would not be my recommendation, though. Only use Fcodes ( ) for command that are not otherwise available in ExtendScript and try to design a checking mechanism to find whether the command was actually executed.
The oMyCodes in my code sample should have been changed to oCodesToBeExecuted. I had oMyCodes first but decided to rename it and forgot to change that line.
Kind regards
Jang