A thread is a named conversation lane inside the current node (and harness). Default thread is default. 
/thread
/thread <slug>
/thread new <slug>
/thread shows the current slug and what you are allowed to use. /thread research switches. /thread new research is the same switch with creation-oriented wording. Removing thread state (/thread rm) is not implemented.

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Grants

Extra users may be limited to specific thread slugs. See Access. * means all threads.

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Relock

Default: switching thread locks. telekit passcode relock-on-thread-switch off to carry the unlock.

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/new

Starts a fresh session for the current node + current harness + current thread only. Other lanes are untouched. Sticky /skill invocations on that lane are cleared. Does not lock by default.