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Calling GDB on active objects

PVM supports calling a debugger on spawned tasks. To use this with UC++, change the call of the active object to:

T *t = new(Allocator(ACTIVE,DEBUG)) T(..);

and set the environment variable PVM_EXPORT to DISPLAY, and display to be the name of the machine to disply xterms on (i.e. not just :0 or unix:0).

Then, when the