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PxPLUS has developed an alternative for *NThost/*NTslave. The advantage is that the host needs only 1 tcp socket. That is interesting if you connect via the Internet and thus you need to open only 1 port in your firewall.  PxPLUS uses port 4093 by default. They obtained this portnumber by IANA (Internet Assigned Numbers Authority).

To start the host.

Save this script in /usr/local/bin/starthost on your Unix machine:

#!/bin/sh
PVXLIB=/pxplus/lib
PVXFLMAP=\\/
export PVXLIB  PVXFLMAP
umask 0
cd /pxplus
{su username}
/pxplus/pxplus -dr=/pxplus/ \*plus/cs/host -arg 4093 {forced program} >/dev/null </dev/null 2>&1

and change permissions with  'chmod 777'

Add this line to /etc/inittab of the Unix machine:

pxp1:2345:respawn:/usr/local/bin/starthost </dev/null >/dev/null 2>&1

[ Note for SCO OpenServer 5 users: I usually include this line below the 'r3' line in /etc/inittab ].
Please note that when the kernel environment is rebuild (after linking a new kernel for example), SCO will remove this line from /etc/inittab.

Save /etc/inittab and enter 'telinit q'. You've now started a PxPLUS host program on your Unix machine (using socket 4093) that will wait for *plus/cs/CLIENT  WindX connections.
Please note that on some Unix machines, you will need to reboot in order to have Unix accept this additional inittab line.

If you are using a Linux OS, you will notice that the inittab file is not in use anymore.
In order to have the script autostart when the machine boots, you can use one of the following:

1. There's a /etc/init.d/boot.local script.

Add the following line to that script:

sudo -uuser /usr/local/bin/starthost &

2. There's a /etc/rc.d/rc.local script.

Add the following line to that script:

su user -c /usr/local/bin/starthost &

  'user' is a login name from '/etc/passwd':
  This user (or the one that you select) *MUST* be available in /etc/passwd. Verify that you can login and start PxPLUS with this user.

If you want to start the host automatically (as a service) in a Windows environment, use *plus/cs/service. This program asks for a starting directory, tcp port and which program to start.  Then you need to go to 'control panel' > 'services' and change the status from 'manual' to 'automatic'.