Internetchess can be differentiated in "livechess" and "turnbased chess".

In "livechess" you play with your opponent one game only, both players must be online,there are no breaks,mostly short time limits (5 ,15,60 minutes,two hours for the whole game): both players play "synchron"!
It is the same as in OTB games:Helps and aids are forbidden. At livechessservers like "playchess.com" (the Fritzserver) players will disqualified automatically if they use software.Every day if you play there you can see such messages in the display.There can control it!

But in "turnbased chess" you play many games,both players must not be online at the same time,there are breaks of sometimes several days,the time limits are in days and not in minutes or in hours : the players play "asynchron".
That means we have here a kind of correspondence (server)chess (beside cards,fax,email) and in correspondence chess a l l kind of helps and aids are allowed.All strong correspondence chess players worldwide use programs to analyze their games.Look at the homepage of the ICCF http://www.iccf.com/
Do you find there any prohibitions? (because prohibitions make only sense if you have possibilities of a control)
The chances are now equal again,the question is only : how good can a player work with these helps?