way to keep program in memory

[geisj at pagestation.com (Jerry Geis)]

Is there a way to specify that program X should be kep in memory and not 
swap it out?
I have a program that takes some time to load and as long as you keep 
using it its responsive
but if after sometime its not in use and now I use it it has a slow 
response till it gets swapped back in.

The box in question has 1 GIG ram and its not running much else just 
this program really. Just looking
for a way to keep it in RAM.

Thanks,

Jerry