Master Gump

[Praxiiz]

The generic gump in the (7.0.1.1) client handles the following keywords:

1. page
2. nodispose
3. nomove
4. noclose
5. group
6. endgroup
7. gumppic
8. tilepic
9. tilepichue
10. text
    
11. croppedtext
12. textentry
13. textentrylimited
14. radio
15. button
16. buttontileart
17. checkbox
18. resizepic
19. htmlgump
20. xmfhtmlgump
21. xmfhtmlgumpcolor
22. xmfhtmltok
23. checkertrans
24. gumppictiled
25. tooltip
26. mastergump

I have found matching gumpentry subclasses or settings in the basegump for every entry except mastergump. Does anyone know what the mastergump keyword does or how it works?