IBM QSAM Question: Download IBM QSAM PDF

What is QSAM? Use of the QSAM? How it is used?

QSAM (Queued Sequential access method), it's a sequential
file. Correct me if i am wrong.

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What is QSAM file?	Suppose I have a KSDS File. I have a Records like 1,2,3,4,5,6,...100. I want to read using Dynamic mode like from 10 the Record onwards like, 10,12,14,16,18,....60. Wat is the command for this?