When you select the Threads folder in the left pane, the Details list and tab display, as well as several other tabs. These other tabs give you access to additional information about each type of thread, as follows:
DIST – displays information about distributor threads.
DSI – displays information about DSI threads.
RSI – displays information about RSI threads.
SQM – displays information about SQM threads.
SQT – displays information about SQT threads.
See the Replication Server Administration Guide Volume 1 for more information about Replication Server threads.