I do a lot of e book reading at work using Mobipocket.
Sometimes I forget the time so I'm wondering if there is a keyboard shortcut for the clock that you can access without backing out of the Mobipocket software?
(Mobipocket should add a clock functionality to their reader software)
That's the same problem I have with Viigo and others and there isn't a keyboard shortcut for the Clock app. What you could do though is assign one of the convenience buttons or use a 3rd party app like BBSmart Shortcuts.
I'm not sure if I understand the issue you're having, but my solution would be to hit the "End" key to check the time and then go back into Mobipocket.