"look ahead" .DLLs

[john hamon <jhamon@xxxxxxxxxxx>]

list,

i understand that there are several different .DLLs that allow you to look
ahead from an earlier bar using easy language.  stuart okorofsky (sp?) has
one, as do pierre orphelin and sam tennis.

questions: 

1. are these all the same?  
2. does anybody have experience with more than one and are they all equally
easy to use?
3. do they in fact eliminate the max bars back problem?

thanks for your help,

jh