Adapter protein which modulates signaling mediated by several receptor tyrosine kinases. Plays a role in fluid homeostasis, probably downstream of receptor egl-15 and upstream of let-60/Ras (PubMed:11689700). Involved in nicotinic acetylcholine receptor (nAChR)-mediated sensitivity to nicotine and levamisole and gamma-aminobutyric acid (GABA)receptor-mediated sensitivity to muscimol (PubMed:15990870). Regulates synaptic levels of nAchR receptor subunit lev-1 and unc-38, and GABA receptor subunit unc-49 in the nerve cord, probably downstream of egl-15 (PubMed:15990870). Regulates motility (PubMed:15990870). During the formation of neuromuscular junctions at the larval stage, down-regulates membrane protrusion from body wall muscles, probably downstream of egl-15 (PubMed:16495308). Promotes vulva induction and down-regulates fertility, probably downstream of receptor let-23 (PubMed:16547100). Down-regulates daf-2-mediated repression of dauer formation and positively regulates daf-2-mediated aging (PubMed:16547100). May be involved in the recruitment of phosphatase ptp-2 to egl-15 (PubMed:11689700). Interacts (via C-terminus) with sem-5 (probably via SH3 domain 2) (PubMed:16547100). Interacts with nicotinic acetylcholine receptor (PubMed:15990870). The PH domain is required for fluid homeostasis. The C-terminal domain is required for fluid homeostasis. May be phosphorylated. Causes a decrease in synaptic levels of lev-1, unc-38 and unc-49, a moderate resistance to paralysis induced by nicotine and levamisole (PubMed:15990870) and a mild increase in uncoordinated movements. In addition, forms ectopic muscle membrane extension during larval stage (PubMed:16495308). Rescues fluid accumulation in clr-1 e1745ts mutant (PubMed:11689700). Partially suppresses multi-vulva formation and partially restores fertility in let-60 1046gf mutant (PubMed:16547100). Prevents constitutive dauer formation in daf-2 m577 mutant (PubMed:16547100).