There are 7 muakkalat associated with it,which are pretty strong and difficult to control.There are only few Kamil aamils of chehel kaaf ie the ones who fully control all the 7 muakkilat, it is a serious and deadly game to try it.I know people who have lost their minds and even life trying it, BUT those who just want to come in contact and get some benefit from them are many and is comparatively easy to do.
There are many versions of CHEHEL KAAF,in circulation,almost all wrong and so useless
METHOD.
To become complete Aamil one has to say it 1000 times daily, with "tarke jalali and jamali" for 40 days,in etekaf,preferablyy under supervision of an aamil,once chilla is completed then 100 times a day is enough.This brings all the seven muakkilat under control,but is extremely dangerous,and is not recommended.
Second method is to say it 300 times daily for 40 days,no tarke jamali,jamali or etekaf is needed,but this just makes mukkakilat friendly and familiar with you,you may use,then,chehel kaaf for jinnat etc,it usually works.but as you have no real power over muakkilat,it is not as perfect as the first method,but it is safeThe best use of Chehel Kaaf is for increasing one's spirituality. The aadad for various Salasil are:
Chistia : 200 times per day in one nashist khafi lisani with Wudu
Qadria : 300 times per day in one nashist khafi lisani with Wudu
Naqshbandia : 100 times per day in one nashist Qalbi with Wudu.
Awwal o Akhir 11 times Durood Sharif of your choice for all of the above.
Use :
For Jinnat : 7 times loudly in right ear for 7 days
For Jadu : 11 times dam on water and give to patient 3 times a day for 11 - 21 days.
For Kashful Quboor : 500 times daily in one nashist with wudu.
For Kashful Quloob : 500 times daily in one nashist with wudu.
For Tasarrufat e Ruhani including Salb e Amraaz: 1000 times daily in one nashist with wudu.
Please note that when you start reciting more than 300, the Moakalat become attracted intensely and there is a possibility of reflection of this attraction on the reciter. This reflection can manifest many side effects, varying from harmless but emotionally charged hallucinations, to actual bodily harm.