When the SRAND is presented with a TRUE condition it will read the value of seed variable and generate a pseudo random number output.
The mapping from seed variable to output variable is constant. For same seed You always get same response.

You can take response value and assign it to seed variable and depending on the length of the epoch the output will appear as a random number sequence ... until the epoch is finished and it repeats again.

Often used in spread spectrum communications as a spreading function.

Where it might be useful to You ... hmmm... don't know.
I have used it in the past in fact i wrote my own pseudo random function based on a sixteen bit polynomial.

The epoch is the length of the pseudo random sequence before the unique inpur response pairs start repeating.

Some solutions ( polynomials are sub optimal) produce same response for two different inputs as such they are as useful as an ashtray on a motorbike.

for more info ... google M sequence linear feedback shift registers

You might want to write a little routine ... a modem to send info to your PC... and a SRAND with output fed back to seed with a printout of seed output pairs.

Import text into a spread sheet and plot it for visual feel.

My apologies...

random function is a function whihc takes an input number the seed.

It then uses the seed to calculate the random function value.

You can use the random function output to do what ever you need it for.

If you feed the the output of random function back into itself, it will calculate a new random value.

If you keep feeding the output back into the function You will keep on getting new random function values.
Eventually You willstart to see numbers You have already seen.
You will have reached the end of the "EPOCH" of the pseudo random generator.

How you use this is up to You.

May be You can use it as a source of noise say to inject a bit of noise into a mechanical system whihc needs a bit of noise to prevent it from sticking into one position... or may be some other application..The pseudo random generators are based on Maximum length polynomial expressions which if say 8th order will have 255 distint solutions.

Non maximum length 8th order polynomial will have fewer than 255 solutions.

Maximum length polynomials are used as spreading functions in spread spectrum communications. Where You use it is up to Your application, I used it to flash a light source whihc due to data randomness causes the eye blink response to be triggered.

the difference between RAND and SRAND in the context of above explanation is that RAND is identical to SRAND with new seed value permanently fed back from output of SRAND function permanently so that just like RAND the SRAND returns a new value everytime it is called .

With RAND you get a new value everytime You call it... same with SRAND when output fed back into input.

Ziggy thank you very much, this is much better to understand what it does, this also allow me better to understand what the example in the manual is trying to explain.

If I have more time, I will try it out in practice.

To Ihor, the last version of LDmicro is the best version I ever had, a pleasure to work with. Thx