Looking for a reasonable setting to set optimum memory for workstations of all memory sizes as a rule of thumb.

Local lcOrigFore, lcTotMem, lnRealMem,lcMem
lcOrigFore = SYS(3050,1)
lcTotMem=SYS(1001)              && Total available memory to VFP, including VM
lnRealMem=VAL(lcTotMem)/4       && Get the physical memory from the pool
lcMem=SYS(3050,2)               && default background memory!
IF VAL(lcOrigFore)<(lnRealMem/4)
   =SYS(3050,1,lnRealMem/4)     && Reduce the physical memory pool by 4   
ENDIF
IF VAL(lcMem)<(lnRealMem/4)
   =SYS(3050,2,lnRealMem/4)
ENDIF

Is the above realistic? We want to set it if no previous setting exists in an ini file - which we can do easily, but the trick is that if no specific setting was chosen for a particular workstation, then what to set it to by default?

Any ideas and experiences are appreciated. Most workstations are Pentium 4 with memory raning from 256mb-2mg RAM. There are a few Celuron processors out there with memory in the same range. I have a form for setting the memory manually on a workstation and storing the setting in an ini file and reading it when the app starts, but if no setting previously existed then I need a default setting to use and currently we are using the above formula.