Licensing
ClearQuest uses FlexLM for licensing; each user who logs into ClearQuest must be able to obtain a FlexLM license from the available pool, or they will be denied access to ClearQuest.
Note that no licenses are consumed by programs and scripts utilizing the ClearQuest API. The rationale behind this decision being that programs run by administrators against their installation must not fail due to insufficient licenses.
Read more about this topic: IBM Rational ClearQuest