Activating foreign images 
 How to figure out symbol names for DCL structures
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$ ANAL/SYS
SDA> read sys$loadable_images:dcldef
SDA> form/type=prc @(ctl$ag_clidata+ppd$l_prc)
SDA> form/type=wrk @(@(ctl$ag_clidata+ppd$l_prc)+prc_l_currwrk)

Offset defintions are in the source listings at [DCL.LIS]DCLDEF.*

All offsets within the structures are subject to change at each release.