VB - Memory Access

hi,
i would be able to read ( and write ) to memory of another application.

is it possible ? how ?

i want to reach information by locating with a string in the memory zone of this apps.

how can i find the memory region of an application.
how can i read this mem , and write to ???

i think i can do this with some API but i m not good enougth to find it myself.

any help welcome

(Sorry for the grammar / word , english is not easy for me.)