Is possible to read the design files 0AD PROCESS, 0AD CHILD, 0AD WIDGET etc. of the current application?

Yes. You must explicitly open and close each design file that you want to read. You must set the NEXT APPLICATION and NEXT VERSION fields before each open.

For Example:

SET --- NEXT APPLICATION = XXX

SET --- NEXT VERSION = YY

OPEN 0AD PROCESS

READ 0AD PROCESS

CLOSE 0AD PROCESS