You can find the version number of any installed package at the
terminal:

$ dpkg -l rtai-modules-2.6.15-magma
||/ Name           Version        Description
+++-==============-==============-============================================
ii  rtai-modules-2 3.3-1+aj4      rtai modules for Linux (kernel 2.6.15-magma)

Thus, the rtai on this system (installed from the emc2 dapper live cd) is based
on rtai 3.3.

I determined the correct package name using 'dpkg-query -S', which says
what package name is associated with a particular installed file:

$ dpkg -S /usr/realtime-2.6.15-magma/bin/rtai-load
rtai-modules-2.6.15-magma: /usr/realtime-2.6.15-magma/bin/rtai-load

I could also have used a wildcard with dpkg -l, guessing that the
package name started with "rtai":

$ dpkg -l rtai\*
||/ Name           Version        Description
+++-==============-==============-============================================
ii  rtai-modules-2 3.3-1+aj4      rtai modules for Linux (kernel 2.6.15-magma)

(some command output trimmed a bit for clarity)

Jeff

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