ILBONTR0 LE stuff?

[Steve Gentry]

We were running a program (COBOL) and we got a message that the following name
ILBONTR0 was undefined.
I know what undefined means, i.e., it didn't get compiled into the program.
But what is the module used for and where is it located?
We are running VM 5.2
Thanks,

Steve G.