problem with auto presssing

[Mutalgaettae]

wen i execute multiple codes,

i notice sometimes 2-3 different keys run at once

but only one functions.

for example, coincidentally button a,b,c are pressed

but only button b is pressed.

is there any way to allow multiple input at once?

and also.. how can i hold the key down?

and can i hold a key down and press another key at once? (2 diff program running at once. not one program holind a key and pressing at same time, but all autoit running)