IBM i security certificates - did I just screw myself

(I had this in another thread and should have started a new one.)

I'm doing a bit of investigating on certificates for something I want to do
after vacation. Went into the *SYSTEM store and the Local CA.

Now I've got myself in somewhat of a panic. The certificate I saw said it
expired 6/18/2012, so I thought nothing could be using it. So I renewed
the certificate (Default I think) and when I do the Work With Client
Applications I see this:


Work with Client Applications

Application type: Client

You can add an application or select an application to work with from the
list.
Applications registered to use certificates:

Application Certificate Assigned

IBM Directory Server publishing None assigned
IBM Directory Server client None assigned
Enterprise Identity Mapping (EIM) None assigned
IBM i TCP/IP FTP Client None assigned
IBM i TCP/IP SMTP Client None assigned
IBM i TCP/IP Telnet Client Default
i5/OS DDM/DRDA Client - TCP/IP None assigned

Does that mean Telnet (Mochasoft or Client Access PC5250 sessions) are
using this and I have just shot myself in the foot? I looked at one of my
PC5250 sessions and under Communications/configure/properties it has the
"Default" box checked under "Client certificate to use" but the whole area
is grayed out. If it was expired, how could Telnet be using it?

Sorry to be so ignorant on this, but I have never understood certificates.