Lisp Machines provide ways to 'manually' manage memory for things like network stacks. If a Lisp Machine is doing a global full GC (which it wants to avoid as

Lisp Machines provide ways to 'manually' manage memory for things like network stacks. If a Lisp Machine is doing a global full GC (which it wants to avoid as much as possible), then it does not react in any useful way to inputs, the network, ...