fopen ( ..., "a" ) --- how does the "a" work?

[Doug Gwyn]

In article <1989Dec9.000805.1617 at chinet.chi.il.us> les at chinet.chi.il.us (Leslie Mikesell) writes:
-In article <11775 at smoke.BRL.MIL> gwyn at brl.arpa (Doug Gwyn) writes:
->On a single-user non-multitasking system, a better implementation would
->be to seek to the end only on the initial open, not for each write.
-But what if the single-user non-multitasking system is networked to
-a shared filesystem and you would like your log files to work?

Suggest you look up "system" in a decent engineering textbook.
You described a system that doesn't fit my qualifiers.