Hm... If I unterstand you right you want to use functions from
VCL-Units e.g. SysUtils.
You could include Units from the
VCL, but then your programs are bigger. So I would say: Don't do this.
You should work with the
Win32-
API-Translations by the JEDIs! So you can use all
API-Functions. And the most of the
VCL-Functions are only simplyfications of the
API-Functions.
Chris