what in particular are you having

what in particular are you having trouble with?
F# has

ref T

ref T

via

byref<'T>

byref<'T>

in T

in T

via

inref<'T>

inref<'T>

out T

out T

via

outref<'T>

outref<'T>

you can declare pointers via

nativeptr<'T>

nativeptr<'T>

and for external functions in particular (

DllImport

DllImport

) it directly supports

T*

T*

and

T&

T&

for pointers/byrefs

what in particular are you having - Silk.NET