I wanne distinguish some general concepts in jBASE

Dear all,

I'm a newbie with T24 system. During my study, could you help me to make some discriminations between jBASE's concepts:

1. What differences between jBASE command language (jCL) and jBASE BASIC language? What're main purposes of each language?
2. Could we use SQL to manipulate jBASE database? What pros and cons of jBASE Query language over SQL commands?

Thank in advance :-)