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Exception Management
- 16 bit interfaces are per process
- signals (ctrl-break/ctrl-c is per screen group)
- harderror (popup) suppression for filesys
- 32 bit interface is like try/catch/throw in C++
- Each thread is independent
- XCPT_SIGNAL is sent to thread 1
- Asynchronous exceptions can be held with DosEnterMustComplete
- Handlers MUST be registered on the stack
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