I use SDL for creating threads. Consider it relevant only if you''ll show me some code. The most important part: I''m looking for a parallel algorithm (even pseudocode or just a paper about mathematic formula - I can handle everything) to solve a linear system: [a11 a12 ... a1n ] [ b1 ] [ ] [ b2 ] [ x1 x2 .. xn ] * [ .. ] = [ b3 ] [ ] [ .. ] [an1 an2 ann ] [ bn ] Thanx in advance. ----------------------------- Codman - "The source for all things" "We design for eternity" Mail: Codman_Wu@personal.ro