Re: For the non-programmers amongst us...
My guess - disabling the page file so that none of the pages can be swapped out.
Modern Unix/Linux systems allow you to lock pages into memory so that they cannot be swapped out, but I don't think that Solaris/SunOS had that capability way back then (but I could be wrong - its a long, long while since I've done any work on Solaris/SunOS).