Decouple screenshot script from Xmd, Xmd session from Mwm

INSTALL.md

@@ -49,6 +49,11 @@ in their respective subdirectories:
 
 ## Session
 
-Xmd includes a startup script and assorted "glue code" to facilitate using it as
+Xmd includes several scripts to facilitate using it as a desktop environment. It
-a desktop environment. It can be installed using `./install.sh` in the `session`
+can be installed using `./install.sh` in the `session` directory.
+
+## Glue
+
+Xmd includes some utility scripts to provide a standard interface for things
+like screenshotting. These can be installed using `./install.sh` in the `glue`
 directory.

session/src/xmd

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+export XMD_SESSION_PID="$$"
+
 export XMD_USERDIR="${HOME}/.Xmd"
 mkdir -p "${XMD_USERDIR}"
 
@@ -26,4 +28,4 @@ else
 	echo "!!! cant find $startupDir"
 fi
 
-exec mwm
+sleep infinity

session/src/xmd-end-session

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+if [ -z "$XMD_SESSION_PID" ]; then
+	echo "ERR session is not running (\$XMD_SESSION_PID not set)"
+	exit 1
+fi
+
+kill "$XMD_SESSION_PID"