pease be with you

hi

there is a big problem !!!

i get a api code called " RegisterHotKey " , in the consts there is :

Code:
Private Const MOD_ALT = &H1
Private Const MOD_CONTROL = &H2
Private Const MOD_SHIFT = &H4
me question is : ??

i want to know what this means ( " &H1 " " &H2 " " &H4 " ) and it's name ??

if this characters mean a thing in a " keyboard " plz write to

all the keyboard keys in this case

thanks