J I have worked on a number of real time systems under VMS and I have alwaysK meant to write a peek into mailboxs program. About a year ago I finally got J round to it. The program knows about mailbox message formats for V5.4 thruK V6.0. It will need changing if/when DEC ever change it in a future release.   2 To run the program define it as a foreign command:   mbox :== $fullfilespec:mbox.exe    *NOTE*  K If you do make any changes, find any bugs or even just have some good ideas I about the program *PLEASE* let me know about them. If you think there are 3 synchronisation problems with the code let me know.   	 Problems:   N It does not see the first few mailboxs in the system as these are not returned by sys$device_scan.   K Deassigning a channel to a mailbox seems to cause all processes in RWMBX to L become computable. So in order to see processes in RWMBX the program does anM arbitrary wait after deassigning mailbox channels to full mailboxes. This may  be subject to timing windows  O I dont like the output format that much but I just dont have the brains to come  up with anything better.  	 Have fun.   0 Neill Clift (neill@macro.demon.co.uk) 7-Dec-1993