ISAPI replacement

[Novak, Jira (CAP, GCF)]

Hi people.
I change IIS to Apache and I have any ISAPI extensions.
I have problems with ISAPI fully functionality under Apache, so I'm
searching for ISAPI replacement.
I need call windows dll from apache but without dll unloading after web
request end.
(I need hold open connections from dll to next applications for maximum
performance)
I don't know how make it.
Thank you very much for help.
Jiri