Undo customization for a function

[weber]

Hi folks.

Suppose a function F that is executed several times in a row.
Is there any way that I can customize undo behavior so that undoing
reverts all changes for sucessive calls?

Something like this:

state A
user calls `insert'
state B
user calls `F'
state C
user calls `F'
state D

and after this, calling undo reverts buffer to state B?

Thanks in advance,
weber