C language

I have a couple of C related questions, and since there is no idRange C forum I thought I'd try here..........

I've managed to get an external DS 'seen' by my C program by using the #pragma directive.
The DS contains fields named XXXXX#. When the program is compiled the fields end up being called XXXXXp (lower case p). I presume this is because C does not allow special characters in variable names. When I reference the variable as XXXXXp, the compiler says the variable must be declared before being used.

A second question........I want to be able to call a program who's name will be held in a variable. I've come across references on how to do it with the #PRAGMA directive, but only if the program name is known at compile time.  I need  to be able to do it dynamically at execution time.

Thank You
Mike Pantzopoulos