On Jun 16, 3:13 pm, שלמה יכין wrote:
Hi all
i work in a company that uses 2 main applications - based on win xp pro.
the application uses the LPT port in order to communicate between an
external pedal and the 2 applications mentioned, but there is a difference in
the way they do so.

one application uses the lpt option "Never Use An Interrupt"
while the other uses it under the option to "Use Any Interrupt assigned to
the port"

(to see what i'm talking about go to :
Device Manager = Ports (COM & LPT) =ECP Printer Port 'properties' = "Port
Settings" Tab. )

now, we want both application to be able to work - based on user logon.
meaning, a user logon - or even an earlier choice menu such as "Hardware
Profile" menu should "Switch" those option to its wanted form.

we tried to implement a registry change upon user logon but there is no
change. further more - if we try to implement the registry change After user
is logged on (manually) - the system announces that it cannot add those
values to registry because the system probably uses those ports.

we also tried to create 2 different hardware profile, but it does not change
the way the lpt will handle interrupts, it can only determine weather the
device is enabled or disabled.

any ideas?

Thanks in advance
Shlomo

XP is "Plug and Play (aka Pray)" aware operating system. If the PC is
"set-up" as an ACPI Multiporcessor PC in Device Manager, you will not
be able to change any settings within XP. This forces the XP to use
the settings "recorded" in the "Plug and Play" functionality. You
may be able to set up the required settings with the PC's BIOS.