DTM Data Comparer supports following command line switches:

-r - if project configured, run compare at program startup

-s - if project configured, run synchronization at program startup

-q - quit application after the project execution

-PM - switch "performance mode" on. This mode increases comparison speed for about 10-15% but produces less diagnostics. The program shows {PM} in the windows title when this mode is switched on.

-c - console mode.

Also you can use project name as a command line parameter. Please note that you should use quotation for path or filename with spaces:
"c:\Program Files\dcmp.exe" "D:\Projects And Files\test2testscr.dcmp"