Where is template_preprocess() located where is the template_preprocess() function located? It seems that my markaspot theme (mas) call this function but I can not find this funktion in a file. 

Thanks for your help.
It's in 

includes/theme.inc. 


Docs are here.

Next time just put the name of the function in Google...the docs on Drupal.org will tell you what file any function is in.