Is there any documentation about the /Ln parameter (i.e. what the values of n can be and what they mean)?
The specifies the screen scaling factor that the TINY client should use at startup. Higher values make for a larger (and blockier) client window. “/L1” specifies that one pixel on the host should correspond to one pixel on the client (the default), “/L2” specifies that the client window should be twice as big as the HOST screen in pixels (each host pixel corresponds to a 2×2 block on the client), etc.