AppleTalk Remote Access 1.0 requires approximately 450K of RAM when calling into another Remote Access system; answering requires an additional 110K of RAM. Generally speaking, this would leave between 230-330K of memory free
in a 2MB system for other activities.
You can quit the Remote Access application while maintaining the remote connection. This frees roughly 200K of memory.
AppleTalk Remote Access works well in a 2MB environment. But if you want to keep several applications open (using the multitasking feature of System 7) while maintaining a remote connection, you should consider increasing the RAM in your system.