What are the function of a glycoprotein and glycol lipids?

Glycoproteins:

Glycoproteins are proteins containing covalently attached oligosaccharides

There are two types:

a. O-linked at Ser and Thr
b. N-linked at Asn when it occurs in the sequence: X-Asn-X-Thr, where X is any amino acid

Synthesis of the carbohydrate portion of glycoproteins occurs via a series of specific enzymes that can recognize specific carbohydrate or protein structures. There is no template as in DNA, RNA, protein synthesis.

Since the oligosaccharides are often branched, unlike the amino acids in proteins, they can code for more information with fewer residues.

Functions:

a. cellular zip codes, these carbohydrate structures determine which proteins are exported (secreted), which are incorporated into the cell membrane, and which are destined for the lysosome.

b. involved in cell-cell recognition and adhesion

c. recognition of self vs. other by the immune system
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This is what I found for the function of Glycoprotiens, I however haven't found Glycol Lipids...