Max Coins In 1 Transaction Help

Hi,

i have been looking into the bitcoin source and to try and understand each coin's characteristics from a code perspective. i am having trouble in identifying the constant that determines the maximum amount of coins you are permitted to send in one go.

can anyone give me any pointers as to where in the code this check is made? i know there are checks to determine whether the maximum transaction size is too big.. i assume its somehow tied into that. if that is the case does anyone have any rough equation i can put in to get the number out (i know the max amount varies per coin) or can they point to the lines of code that contain the upper limit checks.

my main goal is to produce a small database of various coins and hold stats on them (one of which is the max amount of coins permitted per transaction).

any help would be greatly appreciated!