Zero-width Joiner in Persian Typing

Within a word, some Persian letters are never joined to the next letter, e.g. ALEF "ا" and DAL "د". Some others may or may or may not be joined, such as HEH "ه" in "کلمیها" and "کلمه‌ای", which are two distinct words. In order to type "کلمه‌ای" on a keyboard, the ZWNJ should be used between HEH "ه" and ALEF "ا".

ZWNJ can be entered in the following ways:

• In standard Iranian keyboard, use [SHIFT + SPACE] or [SHIFT + b]. (The former may not work on same operating systems.)
• In "Farsi" keyboard of Microsoft, use [CTRL + SHIFT + 2].
• On any Microsoft windows, you can use [ALT + 0157] on keypad when Num-Lock is lighted.

Source: http://www.nic.ir/IDN