Do PPL program input parameters accept symbolic arguments?

[Helge Gabert]

In a PPL program (Home environment), is it possible to pass from the command line a symbolic argument to the program?

For example, run MYPROGPPL(k1,k2,k3). Here k3 should contain 'X' or 'X^2' or something like that (defined by the user at program start).

Then, for example, integration could work with \int (from the template) like \int(k3,'X',k1,k2);

This is all no problem with a CAS program,

e.g., MYPROGCAS(k1,k2,k3) with k3 containing 'x^2' can run int(k3,'x',k1,k2); just fine,

but I'm running into problems with PPL and symbolic arguments.