I'm confused about TERMCAP

[Richard Bronosky]

I'm using "Screen version 4.00.03jw4 (FAU) 2-May-06" on Ubuntu Edgy.
It seems that invoking screen is creating a TERMCAP that is not making
vim happy.

How can I stop screen from defining a TERMCAP?  I don't have one
before I go into screen, and vim works as expected.  Specifically
Home, End, and other special keys.

Where can I learn more about TERMCAP and terminal emulation?
Specifically how to debug and fix problems.  I never know where in the
stack the keycode mismatch is happening. (Terminal
App>bash>screen>bash>ssh>bash>vim)  It's very frustrating.

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