One of:
 message using <A>scii
 <B>io
 <C>onfiguration
 message with <E>ditor
 <F>loor
 re<G>istration
 <M>essage
 <P>assword
 <R>oom
 <T>extfile
 file using <X>modem
 file using <Y>modem
 file using <Z>modem