EXECUTE = "algname";     Execute algorithm in specified file

The EXECUTE statement terminates the current algorithm and causes DAN
to compile and execute the algorithm in file 'algname'.  This
capability allows multiple DAN algorithms to be successively
executed.  The last statement in each algorithm should be an EXECUTE
statement directing DAN to the next algorithm.  The last algorithm in
the chain would not have an EXECUTE statement.  If 'algname' is the
file name of the currently executing algorithm then DAN will
endlessly compile and execute the same algorithm until the operator
presses the ESC key to abort execution.

Control parameter settings are maintained from their current settings
at the point where the EXECUTE statement is invoked except for
XAXIS, and any control that requires a string (e.g.  FILE, LABEL). 
Also, files that are created in the current algorithm will not
be known in the next algorithm unless they are SAVEd in the current
algorithm.
