cleartool find is a good start.
You can execute those anywhere within your (snapshot or dynamic) view
To generate the list of those elements which contain a version with a predetermined label (REL1) attached, use the following syntax of the cleartool find command:
UNIX and Linux:
% cleartool find -all -element '{lbtype_sub(REL1)}' -print
Windows:
cleartool find -all -element "{lbtype_sub(REL1)}" -print
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…