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Reference.org
Time Sharing Option
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<p>Time Sharing Option (TSO) is an interactive <a href="/facts/Time-sharing/LE5XT9Go">time-sharing</a> environment for <a href="/facts/IBM_mainframe/0kPkgADx">IBM mainframe</a> operating systems, including <a href="/facts/OS%2f360_MVT/nQbdNbx6">OS/360 MVT</a>, <a href="/facts/OS%2fVS2_(SVS)/EJ7oJT6D">OS/VS2 (SVS)</a>, <a href="/facts/MVS/VPSmB9ML">MVS</a>, <a href="/facts/OS%2f390/9buuv7H9">OS/390</a>, and <a href="/facts/Z%2fOS/amLCAlgV">z/OS</a>. </p>