116 - Kann ich auf einen ISP-Node von verschiedenen Betriebssystemen aus zugreifen?

Yes and No. For some UNIX variants this would be technically possible, but expensive to implement.
But this is generally not recommended, because an OS flag is set for each ISP node in the internal ISP database and may be overwritten by another OS, so that the access to the node is blocked and a manual access to the TSM database is necessary.
The side effects in such a case are incalculable and data loss is hardly avoidable.
Especially dangerous is the access from Windows to UNIX nodes.