John,
Your last email on this subject contained this statement.
"These things said, there is still a useful distinction to be made between
private screening of one's own PC calls and a proper general PC-screening
facility. The first is easy enough to accomplish using a single, eliminable
level of indirection. The second is not. "
I am interested in knowing the programming tasks involved, some of the
details, in how one would screen their own PC instructions.
--Dave Day
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