[ic] Accessing scratch variables from perl code

[interchange-users@interchange.redhat.com (Tim Nelson)]

Not sure of the difference here, but I had some code that was working with
 $Vend::Scratch->{variable} on IC 4.6 and when I moved it up to IC 4.8
I have to use $::Scratch->{variable}.

1. Can someone explain difference to an Interchange newbie?
2. Is there a _standard_ way to refer to [scratch] (as well as other data)
items in Perl code?

Thanks. Tim