"SFB - KB3MM" wrote in message
...
WIN9X systems only have a fixed size area 64 KB so the amout of RAM is
static.

Windows 9x actually has five fixed-size resource-heaps. Three are 2MB and two are
64KB. It's the 64KB heaps that cause the problem with low resources. If either one
runs out, you can't allocate any further resources on any of the five heaps. However,
as long as free resources are kept above 10% there shouldn't be any problems. If
you're constantly running out of resources, run fewer programs at once. If you still
run out, you have a resource leak (a program isn't releasing reources when it's done
with them). Trial and error will soon identify the culprit(s).

There's no limit in the NT family.

Actually, there is a physical limit (resources are not infinite). However the limits
are so far in excess of most people's needs they are effectively unlimited.