how to open only session files?

how to open only session files?

I have made a session.vim, when it opens all the previous files I was
working on open, this is good.

1) But if I quit vim,
2) later open a file not in the buffer list
3) quit vim
4) open the session file, some files that are NOT part of the session
will be in the buffer list

How do I keep the session.vim file "clean", that is, when opened only
my working files are in the buffer list.

--
Bill
Santa Cruz, California

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