starting a second vim session in diff mode from out first vim

[Eric Leenman]

Hi,

Is it possible from a first gvim session to init a second gvim session
in diff mode?
And this diff mode should then use the two files that are used in the
first gvim session?

So if A.TXT and B.TXT are used in the first, the second should show
the difference in the second gvim session?

Rgds,
Eric