Terminate and Stay Resident Software (TSR) in Linux

Hi,
What is the equivalent of TSR in linux ?
With the help of google, I found in one link that daemons are the TSRs
of linux.
But the TSR concept is quite different from the daemon concept in
Linux.

I find that, A daemon (or service) is a background process that is
designed to run autonomously,with little or not user intervention.

Further, TSR is rather than simply saying "terminate me" to DOS, it
says: "I'm xxx bytes
long. Now terminate me but DON'T OVERWRITE ME." Which is to
say: Terminate me, but let me Stay Resident.
TSR programs will be eliminated by the presence of full
multitasking operating systems.
TSR programs will be here for the duration as
necessary and viable add-ons to otherwise incomplete solutions.

So, how does TSR fit into linux as Linux is a multitasking operating
system with good solutions ?

Kindly share your views / info regarding the TSR in linux .

Thx in advans,
Karthik Balaguru

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