Compatibility: 1.0+
Expects: DX    last addr+1 to keep resident
(note: DX is an offset from the PSP segment)
Returns: none  (not applicable)
Info: This service terminates the caller, leaving a portion of memory
allocated and resident in memory.  Subsequent programs will not
overwrite the code or data left in memory.  See TSR for a list of
related topics.

INT 27H is the traditional method used to install interrupt
service routines and user-definable data tables, but it is
 superseded  by DOS Fn 31H (KEEP).  That fn provides a way to
leave more than 64K resident and it allows you to set an exit
code when you terminate.

INT 27H (and all DOS exit services) restore the vectors for INTs
22H-24H from the exiting program's PSP.  Therefore this service
cannot be used to install a permanent Critical Error or
Ctrl-Break handler.

See Also: fn 31H (terminate and stay resident)
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INT 27H: Terminate but Stay Resident