MVG 1.20p  01/17/90

New feature for Modules: ALT-HELP Capture

This feature is selectable in PREFERENCES: [PRN Capture   yes no]

Purpose:  Tells MVG to take over the Alt-Help screen-dump vector, much like
         those that function from the DeskTop.
          When MVG executes a Module, it will first check this flag and if
         it is SET then the screen-dump vector is re-routed to MVG for the
         duration of the module (upon exit from the module, this vector is
         restored to it's previous state).
         
          MVG will capture the current video display and place it within
         the ClipBoard (provided the CLipboard is enabled. 520 systems
         will more than likely be unable to use this feature).
         
         
Possible Problems:

     Insufficient memory to execute an application from the MODULES menu.
     520's are certain to experience this; 1040's may also experience some
     problems... a 1040 has a buffer of approx 512k of which 256k is released
     for module execution.
     
     MVG opens a full sized window on power-up. It does not close this window
     until MVG itself exits. An open window will cause other 'child' programs
     to leave their last window constantly displayed.
     
     MVG's capture routine uses two calls to the system.
     
     1) XBIOS's _phys_base
     2) BIOS's character output to ring the bell.
     
     Either TRAP instruction may eventually cause havoc. No problem has been
     witnessed as yet.
     
     Some programs intecept the Alt-Help vector and will, thereby, bypass 
     MVG's capture function.