SEE-II is not a separate language but rather a system to communicate in English through signs and fingerspelling.
SEE employs English word order, the addition of affixes and tenses, the creation of new signs not represented in ASL and the use of initials with base signs to distinguish from English synonyms. SEE-II includes roughly 4,000 signs, 70 of which are common word endings or markers.
In comparison to Signed English, SEE-II involves more advanced motoric and cognitive functions.
There have been about 30-40 handshapes defined in SEE and they have many similarities to those of ASL.
ASL is a complete, unique language meaning that it not only has its own vocabulary but its own grammar that differs from spoken English.
This is known today as the Morphemic Sign Systems (MSS).