Requirements: 
- graphic card with OpenGL hardware acceleration and 32-bit color depth,
- Windows XP and computer administrator account.

Create "c:\rcad" directory.
Unzip "rcad.zip" in this directory.
Run RCAD.EXE.

Choose menu items:
 RTOPO
  Load points "c:\rcad\Load points example.TXT"
  Intermediary points
  Triangulation
  Isolines
  Sections
  Edit points

 or

 VDAFS&NC
  VDafsin "c:\rcad\VDA_FILE.VDA"

