add a faq

Updated Home (markdown)

Home.md

@@ -5,6 +5,10 @@
 Frequently Asked Questions
 ===========================
 
++ 	**Multiple commands/shells/subsystems in a connection**
+
+	`Session` objects are not reusable, so you can only have one command/shell/subsystem via `exec()`, `startShell()` or `startSubsystem()` respectively. But you can start multiple sessions over a single connection so you need not reconnect.
+
 + 	**Toning down the logging**
 	
 	sshj uses sl4j, which is just a facade, so it depends on how the underlying logging implementation you are using is configured. For example, in case of log4j this is typically accomplished with a `log4j.properties` in the classpath. Filter out/down messages from the `net.schmizz` category.